Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh viet » ninh viet, trinh vat
viec cac » vien cac, viec cua, viec lam
trinh vi » trinh va, trinh ve, trinh van
cac tru » ca tru, cac tro, cac thu
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
tru va » truc va, tu va, trung va
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 tru va ((trinh vi) OR (trinh viet)) 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 tru va ((trinh vi) OR (trinh viet)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu van ky ((mang xa) or (nang ma)) hoi. nhieu viec cac tru va ((trinh vi) OR (trinh viet)) cuu tre*.