Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
va dinh » van dinh, va kinh, va tinh
doi cua » hoi 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 ky dang xa hoi. hieu va ((cac tuc) or (cac tac)) va dinh ((doi cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky dang xa hoi. hieu va ((cac tuc) OR (cac tac)) va dinh ((doi cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky dang xa hoi. hieu va ((cac tuc) or (cac tac)) va dinh ((doi cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: vu khach ky dang xa hoi. hieu va ((cac tuc) or (cac tac)) va dinh ((doi cua) OR (dai cua)) te*.