Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat soc » cham soc, chat hoc, chat doc
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
dai hai » dai han, dai hoi, dai tai
soc van » hoc van, oc van, sac van
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: ((te sach) OR (vu khach)) ky nang dai hai. hieu van chat soc van hanh vi cua viet~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu khach)) ky nang dai hai. hieu van chat soc van hanh vi cua viet*.