Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, nam thuc, dam thuc
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 5 tang
7 tang » 6 tang
cam tu » cam thu, nam tu, dam tu
cua tu » cua tuc, cua su, cua cu

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 ((y tang) or (7 tang)) ma hoi. hieu ve ((cam tuc) OR (cam tu)) va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((cam tuc) OR (cam tu)) va hanh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y tang) or (7 tang)) ma hoi. hieu ve ((cam tuc) OR (cam tu)) va hanh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach ((y tang) or (7 tang)) ma hoi. hieu ve ((cam tuc) OR (cam tu)) va hanh dai cua tu*.