Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec cac » vien cac, viec cua, viec lam
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
cac truc » cau truc, cac tru, cac trung
cua tre » cua te, cua triet, dua tren
truc va » thuc va, thuc vat, trung va
cuu tre » cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
tu van » tu va

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