Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
lang mai » lang dai, lang hai, lang man
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
ve am » va am

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v ((lang mai) or (nang tai)) hoi. hieu ve am thuc day hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v ((lang mai) OR (nang tai)) hoi. hieu ve am thuc day hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach v ((lang mai) or (nang tai)) hoi. hieu ve am thuc day hanh dai cua viet*.