Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
dinh lai » dinh lam, dinh lap, dinh tai
hieu van » thien van, lieu va, hieu ve
sanh thu » sach thu, san thu, doanh thu
so sanh » do sanh
chuc va » thuc va, thuc vat
lai cua » dai cua, hai cua, lai chau
tang ma » mang may, tang van
va dinh » van dinh, va kinh, va tinh
hieu va » lieu va, hieu qua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thu ((nang cao) or (tang ma)) hoi. ((hieu van) or (hieu va)) pham chuc va dinh lai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thu ((nang cao) OR (tang ma)) hoi. ((hieu van) OR (hieu va)) pham chuc va dinh lai cua su.
• Adding a wildcard symbol may retrieve word variants: so sanh thu ((nang cao) or (tang ma)) hoi. ((hieu van) or (hieu va)) pham chuc va dinh lai cua su*.