Dina ord gav mig mer stöd än du tror.

Because ord is treated as plural here: your words.

• din = your, for a singular common-gender noun
• ditt = your, for a singular neuter noun
• dina = your, for plural nouns

Examples:

• din bok = your book
• ditt hus = your house
• dina ord = your words

Even though ord looks the same in singular and plural, dina shows that it is plural here.

It is plural.

A tricky thing for learners is that ord has the same form in both singular and plural:

• ett ord = a word
• flera ord = several words

So you have to look at the words around it. In dina ord, the possessive dina tells you it means your words, not your word.

Gav is the past tense of ge = to give.

• ge = give
• ger = gives / is giving
• gav = gave
• gett = given

So:

• Dina ord gav mig stöd = Your words gave me support

If you used ger, it would mean present time:

• Dina ord ger mig stöd = Your words give me support

Because mig is the object form of jag.

• jag = I
• mig = me

In this sentence, the words are giving support to me, so Swedish uses the object pronoun:

• gav mig = gave me

Compare:

• Jag gav honom stöd. = I gave him support.
• Han gav mig stöd. = He gave me support.

Because stöd here is being treated as an uncountable noun, like support in English.

Use:

• mer with uncountable nouns or with adjectives/adverbs
• fler with countable plural nouns

So:

• mer stöd = more support
• fler böcker = more books

Since support is normally not counted item by item, mer stöd is the natural choice.

Because stöd is used as a general, uncountable noun here.

Swedish often omits the article in cases like this, just as English does:

• Jag behöver hjälp. = I need help.
• Hon gav mig stöd. = She gave me support.

You would not normally say ett stöd here, because that would sound more like a support in a very specific or less natural sense.

Än means than in comparisons.

So:

• mer ... än ... = more ... than ...

In this sentence:

• mer stöd än du tror = more support than you think

Other examples:

• Han är äldre än jag. = He is older than I am / me.
• Det var bättre än väntat. = It was better than expected.

Än du tror is completely normal and natural.

Swedish can also sometimes use än vad du tror, which is a bit fuller:

• mer stöd än du tror
• mer stöd än vad du tror

Both can mean more support than you think.

Very roughly:

• än du tror = slightly more direct and compact
• än vad du tror = a little more explicit

In many everyday sentences, either works, but än du tror is especially neat and idiomatic here.

Because this is not a question. It is a clause after än.

In normal statements and subordinate-type clauses, Swedish keeps subject + verb order:

• du tror = you think

Tror du is used in direct questions:

• Tror du det? = Do you think so?

So:

• mer stöd än du tror = more support than you think

not:

• mer stöd än tror du

Not exactly. They overlap, but they are not always identical.

• stöd = support, often emotional, moral, practical, or ongoing
• hjälp = help, often more direct or immediate assistance

In this sentence, stöd is very natural because words often give emotional or moral support.

Compare:

• Tack för ditt stöd. = Thanks for your support.
• Kan du hjälpa mig? = Can you help me?

If you changed stöd to hjälp, the feeling would be a bit different.

Yes. That is also correct, but the nuance changes slightly.

• Dina ord gav mig mer stöd än du tror = Your words gave me more support than you think.
• Dina ord har gett mig mer stöd än du tror = Your words have given me more support than you think.

The version with gav is a simple past statement. The version with har gett can feel a bit more connected to the present result.

Both are natural, depending on context.

The strongest stress would usually fall on the important meaning words, often something like:

Dina ORD gav mig mer STÖD än du TROR.

That helps highlight the emotional message:

• ord = words
• stöd = support
• tror = think

Function words like mig, mer, and än are usually less stressed.

The sentence breaks down like this:

• Dina ord = subject
• gav = verb
• mig = indirect object
• mer stöd = object/what was given
• än du tror = comparison clause

So literally, the structure is:

Your words gave me more support than you think.

This is a very normal Swedish sentence pattern:

Subject + verb + object + comparison