Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec cac » vien cac, viec cua, viec lam
va trinh » van trinh, va tinh, lap trinh
cac tuc » cac toc, cac tu, cac tac
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua
di cua » dai cua, doi cua, de 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 sach ty ((nang x) OR (nang ma)) hoi. nhieu viec cac tuc va trinh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang x) or (nang ma)) hoi. nhieu viec cac tuc va trinh ((vi cua) OR (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang x) or (nang ma)) hoi. nhieu viec cac tuc va trinh ((vi cua) OR (di cua)) tre*.