Perhaps you should try some spelling variations:
ban thanh » ban hang
hieu van » thien van, lieu va, hieu ve
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac ly » cac ky, cac le, cam ly
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. ((hieu va) or (hieu van)) cac ly ((ban thanh) or (ban hanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu va) OR (hieu van)) cac ly ((ban thanh) OR (ban hanh)) vi va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu va) or (hieu van)) cac ly ((ban thanh) or (ban hanh)) vi va triet*.