Actually, I speak fluent Thai, there is no word for Yes or No. There is ไม่ which is a negation word, and ใช่ which basically means "correct"/"right", not "yes". The Thai question format is generally:
Q: Hungry? หิวไหม
A: Not hungry. ไม่หิว
A: Hungry. หิว
There are other question indicator words, but the one you're referring to is for "correct or not" type questions, e.g.
Q: This road, right? สอยนี้ใช่ไหม
A: Right. ใช่
A: Not right. ไม่ใช่
Alternatively, for a lot of statements you can just respond with the polite ending words, ครับ for men and ค่ะ for women.
The question, "would you like one of these?" in Thai would be, "เอาไหม่"... literally, "want?". The correct response is then either: ไม่เอาครับ or, เอาครับ ... that is the polite form for "do not want", or "want". There is no other way to respond to that question (except without the polite ending).
Those things you describe are all yes/no questions, so it is not true that there are no yes/no questions in Thai. And what you've described are ways to give (for particular classes of question) answers that mean just the same as "yes" or "no" would for the corresponding questions in English.
It's interesting that English has a category (call it "standard binary questions, answerable with yes or no") that doesn't correspond exactly to anything in Thai. But from what you've said it seems entirely wrong to describe that situation by saying that Thai has no yes/no questions.
There are other question indicator words, but the one you're referring to is for "correct or not" type questions, e.g.
Q: This road, right? สอยนี้ใช่ไหม A: Right. ใช่ A: Not right. ไม่ใช่
Alternatively, for a lot of statements you can just respond with the polite ending words, ครับ for men and ค่ะ for women.
The question, "would you like one of these?" in Thai would be, "เอาไหม่"... literally, "want?". The correct response is then either: ไม่เอาครับ or, เอาครับ ... that is the polite form for "do not want", or "want". There is no other way to respond to that question (except without the polite ending).