Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
su triet » su viet, su tien
khach ky » hanh ky, thanh ky
ve triet » va trien
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
cam tu » cam thu, nam 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 khach ky nang x ho. hieu van cam tu ((ban thanh) or (va danh)) ki ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang x ho. hieu van cam tu ((ban thanh) OR (va danh)) ki ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang x ho. hieu van cam tu ((ban thanh) or (va danh)) ki ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang x ho. hieu van cam tu ((ban thanh) or (va danh)) ki ((su triet) OR (ve triet))*.