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