Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec cac » vien cac, viec cua, viec lam
nang ma » tang ma, sang ma, nang cao
cac luc » cau luc, coc luc, cac nuoc
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
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: tu sac ky ((nang x) OR (nang ma)) hoi. nhieu viec cac luc va tinh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang x) or (nang ma)) hoi. nhieu viec cac luc va tinh vi cua tre*.