Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
sach doi » sach hoi, sach moi, sach dao
doi nang » dai nang, hoi nang, voi nang
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
lam tuc » lam thuoc, lam truoc, luat tuc
dan hai » doan hai, dang hai, dan khai
hai cau » hai chau, hai chu, hai hau
ma hoi » mai hoi, ma hoa, me hoi
va lam » van lam, va lap
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 doi nang ((ma hoi) or (xa hoi)). hieu va lam tuc va dan hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach doi nang ((ma hoi) OR (xa hoi)). hieu va lam tuc va dan hai cau triet.
• Adding a wildcard symbol may retrieve word variants: so sach doi nang ((ma hoi) or (xa hoi)). hieu va lam tuc va dan hai cau triet*.