Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
voi nang » voi hang, hoi nang, voi rang
van nang » van quang, van ban, van dong
danh hai » dang hai, lanh hai, manh hai
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau
co hoi » co hoc, co loi
va cao » va cac, va co, va dao
cao tu » cao thu, co tu, cao su

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 ((voi nang) or (van nang)) co hoi. hieu va cao tu va danh hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((voi nang) OR (van nang)) co hoi. hieu va cao tu va danh hai cau triet.
• Adding a wildcard symbol may retrieve word variants: so sach ((voi nang) or (van nang)) co hoi. hieu va cao tu va danh hai cau triet*.