Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
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
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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