Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hanh dai » hanh tai, hanh dao, vanh dai
co sach » bo sach, cuon sach, hoc sach
tang ma » mang may, tang van
chuc va » thuc va, thuc vat
va hanh » van hanh, va thanh, va danh
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: co sach thu ((tang ma) or (nang cao)) hoi. hieu van pham chuc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach thu ((tang ma) OR (nang cao)) hoi. hieu van pham chuc va hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: co sach thu ((tang ma) or (nang cao)) hoi. hieu van pham chuc va hanh dai cua tu*.