Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van

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

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