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

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. hieu van lam tu ((ban thanh) or (va danh)) ki ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu van lam tu ((ban thanh) OR (va danh)) ki ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu van lam tu ((ban thanh) or (va danh)) ki ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu van lam tu ((ban thanh) or (va danh)) ki ((su triet) OR (su viet))*.