Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
cham sac » cham soc, pham sach, cap sac
viet cua » viec cua, viet ca, viet qua
hieu vu » hieu va, hieu ve, dieu vu
hieu su » tieu su, hieu so, hieu suat
sac van » cac van, san van, sat van
van anh » van thanh, tuan anh, van minh
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) OR (hieu sau)))) cham sac 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) OR (hieu sau)))) cham sac van anh viet cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu vu) or (((hieu su) OR (hieu sau)))) cham sac van anh viet cua tu*.