Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
nang o » nang co, nang ho, nang ro
va dan » ca dan, va dao, va dau
o hoi » co hoi, o hoc, o hai
ki su » ky su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang o hoi. hieu ((van cam) OR (van nam)) tu ((va hanh) OR (va dan)) ki su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang o hoi. hieu ((van cam) OR (van nam)) tu ((va hanh) or (va dan)) ki su tien~".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang o hoi. hieu ((van cam) OR (van nam)) tu ((va hanh) or (va dan)) ki su tien*.