Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » cua viet, su triet, va triet
trinh va » trinh van, trinh vat, trinh ve
va trinh » van trinh, va tinh, lap trinh
viec cac » vien cac, viec cua, viec lam
nang ma » tang ma, sang ma, nang cao
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
tu sac » tu sach, tu cac, tu san

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 xuc va trinh va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang x) or (nang ma)) hoi. nhieu viec cac xuc va trinh va ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang x) or (nang ma)) hoi. nhieu viec cac xuc va trinh va ((cua tre) OR (cua triet))*.