Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
vu khac » vu kham, vu khanh, bui khac
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
soc van » hoc van, oc van, sac van
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

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