Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh viet » ninh viet, trinh vat
viet cua » viec cua, viet ca, viet qua
va trinh » van trinh, va tinh, lap trinh
viec cac » vien cac, viec cua, viec lam
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
cac bac » cac bai, cac ban, cac cach
nang ma » tang ma, sang ma, nang cao
bac va » ban va, bac ha, bao va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ang xa » lang xa, dang xay, hoang xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((((ang xa) or (mang xa))) or (nang ma)) hoi. nhieu viec cac bac va trinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((((ang xa) OR (mang xa))) OR (nang ma)) hoi. nhieu viec cac bac va trinh viet cua tre*.