Perhaps you should try some spelling variations:
viet cua » viec cua, viet ca, viet qua
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
sac van » cac van, sat van, tac van
san van » tan van, luan van, tran van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu
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 vu) OR (hieu su)) cham ((sac van) OR (san van)) anh viet cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. ((hieu vu) or (hieu su)) cham ((sac van) OR (san van)) anh viet cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu vu) or (hieu su)) cham ((sac van) OR (san van)) anh viet cua tu*.