Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
qua cac » cua cac
so sanh » do sanh
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
qua cam » qua cham, qua ca, qua cai
sanh y » sinh y, anh y, hanh y
tai va » thai va, mai va, tri va

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