Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
phan duc » pham duc, phan dau, tran duc
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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 sac ky nang x hoi. ((hieu ve) OR (hieu van)) ((phan duc) OR (phan tu)) van hanh vi cua cu~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu ve) or (hieu van)) ((phan duc) or (phan tu)) van hanh vi cua cu*.