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 tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, mang may
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
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 xa) OR (((nang ma) OR (nang cao)))) hoi. nhieu viec cac tuc va trinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (((nang ma) OR (nang cao)))) hoi. nhieu viec cac tuc va trinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (((nang ma) OR (nang cao)))) hoi. nhieu viec cac tuc va trinh vi cua tre*.