Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
soc ban » hoc ban, coc ban, so ban
hoc bai » hoc dai, hoc giai
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 cac ky tang xa hoi. hieu vu cham ((soc ban) OR (hoc bai)) hanh vi cua viet~.
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang xa hoi. hieu vu cham ((soc ban) or (hoc bai)) hanh vi cua viet*.