Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
hanh lai » hanh lam, hanh tai, thanh lap
sach thu » sach thue, sach thieu, sach tham
so sach » so sanh, bo sach, co sach
nang ma » sang ma, nang cao, mang may
lai cua » dai cua, hai cua, lai chau
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
chuc va » thuc va, thuc vat
hieu va » lieu va, hieu qua
cua tu » cua tuc, cua su, cua cu

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

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