Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
van nang » van quang, van ban, van dong
tham soc » cham soc, tham nuoc, thai son
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
soc van » hoc van, oc van, sac van
te sach » toc sach
dai moi » doi moi
dai hoi » dai hoc, dai hai
vu sach » vu bach, su sach, vu khach
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 sach)) van nang ((dai hoi) OR (dai moi)). hieu van tham soc van hanh vi cua viet~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) van nang ((dai hoi) or (dai moi)). hieu van tham soc van hanh vi cua viet*.