Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van lam » van nam
lam tu » nam tu, cam tu, dam tu
va dan » ca dan, va dao, va dau
ki su » ky su

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 ky nang x ho. hieu van lam tu ((ban thanh) or (va dan)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x ho. hieu van lam tu ((ban thanh) OR (va dan)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x ho. hieu van lam tu ((ban thanh) or (va dan)) ki su triet*.