Pronunciations can vary significantly within Vietnam (especially northern vs southern).
1. Hello - Xin chao - seen chow
2. thank you - Cam on - Gahm un
3. Sorry - Xin loi - seen loy
4. Yes - Vang - vung
5. No - Khong - Khom
6. I - Toi - doy
7. You - Anh / Chi - Ang (male) / chi (female)
8. Good - tot - tote
9. Bad - Khong tot - khom tote
10. How much - Bao nhieu - Bow nyew
11. Too expensive - Mac qua - Mahk qwa
12. Hotel - Khach San - Khack san
13. Ticket - Ve - Vee ah (pronounced similarly to "yeah" in English)
14: Hot - Nong - Nom
15: Cold - Lanh - Lang
16: Coffee - Ca phe - cah feh
17: Hot black coffee - Ca phe nong - Cah feh nom
18: Hot Coffee with milk - Ca phe sua nong - Cah feh swa nom
19: Iced Coffee with milk - Ca phe sua dac - Cah feh swa dahk
20: Tea - Tra - Chah
21: Oh my god - Oi gioi oi - oi zoi oi
22: You're welcome - Khong co' chi (khom go jee)
23: You're beautiful - Co dep qua (coh dep wah)
24: Smile - cuoi len (kuy leen)
25. bathroom - pho`ng ve^ sinh (fonh veah sin)
See also:
Vietnamese language overview and list some most frequently used one-for-one correspondings