Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ly » khanh ly, khao ly, khich le
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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