Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
nam truc » nam truoc, nam thuc, nam trung
tang ma » mang may, tang van
qua nam » quan nam, cua nam, quang nam
nang ma » sang ma, nang cao, mang may
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
so sanh » do sanh
sanh y » sinh y, anh y, hanh y

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang ma) OR (tang ma)) hoi. hieu qua nam truc va hanh vi ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang ma) or (tang ma)) hoi. hieu qua nam truc va hanh vi ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang ma) or (tang ma)) hoi. hieu qua nam truc va hanh vi ((cua triet) OR (cua viet))*.