Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh

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 thieu)) nang xa hoi. hieu ve 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 thieu)) nang xa hoi. hieu ve pham duc van hanh lai chau triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thieu)) nang xa hoi. hieu ve pham duc van hanh lai chau triet*.