Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet
hanh dai » hanh tai, hanh dao, vanh dai
nam duoc » nam thuoc, da duoc, dat duoc
sach kem » hanh kem
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
duoc va » nuoc va, duc va, duoc ma
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 y)) nang ma hoi. thien van nam duoc 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 y)) nang ma hoi. thien van nam duoc 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 y)) nang ma hoi. thien van nam duoc va hanh dai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach y)) nang ma hoi. thien van nam duoc va hanh dai ((cua triet) OR (va triet))*.