Perhaps you should try some spelling variations:
vu khach » vu khac, vay khach, cua khach
vu khanh » vu thanh, van khanh, duy khanh
noi hoi » noi doi, hoi hoi, noi hai
doi hoi » doi thoi, doi voi, doi moi
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
vi cua » vai cua, di cua

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 ((noi hoi) OR (doi hoi)). lieu va cac tu va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khanh)) ky nang ((noi hoi) OR (doi hoi)). lieu va cac tu va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (vu khanh)) ky nang ((noi hoi) OR (doi hoi)). lieu va cac tu va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (vu khanh)) ky nang ((noi hoi) OR (doi hoi)). lieu va cac tu va danh vi cua tre*.