Perhaps you should try some spelling variations:
cau triet » cau trieu, cua triet, va triet
su triet » su viet, su tien, ve 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
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cam tu » cam thu, nam tu, dam tu
co hoi » co hoc, co loi
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((voi nang) or (van nang)) co hoi. hieu va cam tu va danh hai ((cau triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((voi nang) OR (van nang)) co hoi. hieu va cam tu va danh hai ((cau triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((voi nang) or (van nang)) co hoi. hieu va cam tu va danh hai ((cau triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((voi nang) or (van nang)) co hoi. hieu va cam tu va danh hai ((cau triet) OR (su triet))*.