Hulle deursoek die soekgebied.

Hulle means they here, so it is the subject of the sentence.

In other contexts, hulle can also mean them, depending on sentence structure, but in Hulle deursoek die soekgebied, it clearly means they because it comes before the verb.

Deursoek means search thoroughly, search through, or comb through.

It is stronger and more specific than soek, which usually means look for or search for.

So:

• soek = look for
• deursoek = search through thoroughly

That is why deursoek fits well with a place or area being examined carefully.

Because Afrikaans verbs usually do not change according to the subject in the present tense.

So you get:

• Ek deursoek
• Jy deursoek
• Hy deursoek
• Hulle deursoek

The verb form stays the same. This is much simpler than English.

Die means the.

Afrikaans uses die as the definite article for:

• singular nouns
• plural nouns
• all grammatical genders

So unlike languages such as German or Dutch, Afrikaans does not have different forms of the for masculine, feminine, or neuter nouns.

Because Afrikaans usually writes compound nouns as one word.

Here:

• soek = search
• gebied = area / region / zone

Together, soekgebied means search area.

This is very common in Afrikaans. English often writes these as two words, but Afrikaans usually joins them.

Yes, in this simple main clause the word order is basically the same:

• Hulle = subject
• deursoek = verb
• die soekgebied = object

So it follows a normal subject–verb–object pattern:

They search the search area.

That makes this sentence quite straightforward for an English speaker.

It can mean either, depending on context.

Afrikaans often uses the simple present tense where English might use either:

• they search
• they are searching

So Hulle deursoek die soekgebied could describe:

• a general action, or
• something happening now

If you want to make the ongoing action especially clear, Afrikaans can use other structures, but the simple present is very common.

Because the idea of through is already built into the verb deursoek.

The prefix-like part deur- adds the sense of going through something thoroughly. So Afrikaans does not need a separate extra word here.

That is why deursoek die soekgebied already means something like:

• search the area thoroughly
• search through the area

Grammatically, a learner might try that, but it usually does not express the same thing as naturally.

Soek usually means look for something, while deursoek means search through a place.

So:

• Hulle soek die vermiste persoon. = They are looking for the missing person.
• Hulle deursoek die soekgebied. = They are searching the search area.

So deursoek is the better choice when the object is the place being examined.

Yes. Die soekgebied is the direct object.

It is the thing being searched. There is no extra preposition needed.

So the structure is:

• Hulle = subject
• deursoek = verb
• die soekgebied = direct object

This is another reason the sentence feels quite neat and simple in Afrikaans.