It seems: hình như, có vẻ

Two everyday ways to say "it seems". They differ in where your impression comes from.

Hình như opens the sentence, for something you think is true because you heard it or half remember it: Hình như ảnh về rồi. I think he's gone home (in Hà Nội, anh ấy). It's also a polite way to say something you're not sure of: Hình như em gặp chị ở đâu rồi. I think we've met before. Some speakers add thì phải at the end for the same doubt: Ảnh về rồi thì phải.

Có vẻ is about how something looks. It goes after the person or thing, before a describing word or a verb: Chị có vẻ mệt. You look tired. Món này có vẻ ngon. This looks good. To put it before a whole sentence, say có vẻ như: Có vẻ như trời sắp mưa. It looks like it's going to rain. In casual Saigon speech, coi bộ does the same job: Coi bộ trời sắp mưa.

Chắc (probably) and có lẽ (perhaps) make a guess. These two report an impression: use hình như for what you've heard, and có vẻ for what you can see.