Perhaps you should try some spelling variations:
vu khach » vu khanh, vay khach, cua khach
nam thuc » nam thuoc, nam thu, nam tu
vu khac » vu kham, vu khanh, bui khac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ca viet » va viet, co viet, hoa viet
di ca » di cau, di cua, doi ca

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 khac)) ky lang xa hoi. hieu le ((nam thuc) or (am thuc)) va hanh di ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khac)) ky lang xa hoi. hieu le ((nam thuc) OR (am thuc)) va hanh di ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) OR (vu khac)) ky lang xa hoi. hieu le ((nam thuc) or (am thuc)) va hanh di ca viet".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) OR (vu khac)) ky lang xa hoi. hieu le ((nam thuc) or (am thuc)) va hanh di ca viet*.