Hiệu thuốc ở góc đường đó; bạn rẽ trái là thấy hiệu thuốc.

Hiệu thuốc means pharmacy or drugstore.

Literally:

• hiệu = shop/establishment
• thuốc = medicine

So the literal sense is something like medicine shop. In modern Vietnamese, you should usually understand hiệu thuốc as a set phrase, not translate each word separately every time.

You may also hear:

• nhà thuốc = pharmacy
• tiệm thuốc = drugstore/pharmacy

These are similar in meaning, though usage can vary by region and style.

Vietnamese often does not use a separate verb meaning to be in location sentences the way English does.

So:

• Hiệu thuốc ở góc đường đó = The pharmacy is at that street corner

Here, ở already gives the idea of being located somewhere. So Vietnamese does not need an extra word equivalent to English is.

Ở here means at / in / on, depending on context. It marks location.

In this sentence:

• ở góc đường đó =