Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thien van » thi van
sach kem » hanh kem
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
nam duc » nam duoc, pham duc, nam thuc
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa

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 kem) or (sach ty)) nang ma hoi. thien van nam duc va hanh dai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach ty)) nang ma hoi. thien van nam duc va hanh dai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach ty)) nang ma hoi. thien van nam duc va hanh dai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach ty)) nang ma hoi. thien van nam duc va hanh dai ((cua triet) OR (va triet))*.