Perhaps you should try some spelling variations:
pham chuc » pham huu, kham chua, pham huy
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh lai » hanh lam, hanh tai, thanh lap
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
co hoi » co loi
cua te » cua tu

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 ((co hoi) or (co hoc)). hieu ve ((pham chuc) OR (pham duc)) va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang ((co hoi) OR (co hoc)). hieu ve ((pham chuc) OR (pham duc)) va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu nang ((co hoi) or (co hoc)). hieu ve ((pham chuc) OR (pham duc)) va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thu nang ((co hoi) or (co hoc)). hieu ve ((pham chuc) OR (pham duc)) va hanh lai cua te*.