Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
dang cau » hang cau, bang cau, dang mau
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
ky dang » ky nang, ky danh
va nang » van nang, da nang, cam nang
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet

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 dang cau hoi. lieu va nang luc ((va hanh) or (van hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky dang cau hoi. lieu va nang luc ((va hanh) OR (van hanh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu khach ky dang cau hoi. lieu va nang luc ((va hanh) or (van hanh)) thai cua tre*.