Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
ty nang » ky nang, ty hang, ly nang
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 ((ty nang) or (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cam luc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((ty nang) OR (ty xang)) xa hoi. ((hieu ve) OR (hieu va)) cam luc van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: vu khach ((ty nang) or (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cam luc van hanh vi cua viet*.