Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
ca truc » cau truc, ca tru, ba truc
so sanh » do sanh
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
sanh y » sinh y, anh y, hanh y
qua ca » qua cac, qua cua, qua cai

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 ca truc ((va hanh) OR (va danh)) vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang ma) or (tang ma)) hoi. hieu qua ca truc ((va hanh) OR (va danh)) vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang ma) or (tang ma)) hoi. hieu qua ca truc ((va hanh) OR (va danh)) vai cua triet*.