Perhaps you should try some spelling variations:
vu khach » vu khac, vay khach, cua khach
vu khanh » vu thanh, van khanh, duy khanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
va cao » va cac, va co, va dao

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