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