Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
nang cau » nang cao, hang cau, nang dau
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
va nang » van nang, da nang, cam nang
cua tre » cuu tre, cua triet, dua tren
cua te » cua 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 cau hoi. lieu va nang luc ((ban hanh) or (van hanh)) tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang cau hoi. lieu va nang luc ((ban hanh) OR (van hanh)) tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang cau hoi. lieu va nang luc ((ban hanh) or (van hanh)) tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang cau hoi. lieu va nang luc ((ban hanh) or (van hanh)) tai ((cua tre) OR (cua te))*.