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

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