Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat

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 tu nang xa hoi. hieu ((ve pham) OR (ve phan)) vu ((van hanh) or (ban hanh)) tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. hieu ((ve pham) OR (ve phan)) vu ((van hanh) OR (ban hanh)) tri cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. hieu ((ve pham) OR (ve phan)) vu ((van hanh) or (ban hanh)) tri cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. hieu ((ve pham) OR (ve phan)) vu ((van hanh) or (ban hanh)) tri cua triet*.