Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, chau tuyet
cau trieu » cac trieu, cau triet, chua trieu
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu nang » vuc nang, vu dang, v nang
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) va nang xa hoi. hieu vu nang luc va hanh lai ((chau triet) OR (cau trieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) va nang xa hoi. hieu vu nang luc va hanh lai ((chau triet) OR (cau trieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) va nang xa hoi. hieu vu nang luc va hanh lai ((chau triet) OR (cau trieu))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) va nang xa hoi. hieu vu nang luc va hanh lai ((chau triet) OR (cau trieu))*.