Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh vai » trinh van, trinh tai, trinh vat
viec cac » vien cac, viec cua, viec lam
va trinh » van trinh, va tinh, lap trinh
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, dang xay, mang cua
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
tro va » tao va, tho va, tro ba
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 (mang may))) OR (nang ma)) hoi. nhieu viec cac tro va trinh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky ((((mang xa) OR (mang may))) or (nang ma)) hoi. nhieu viec cac tro va trinh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu van ky ((((mang xa) OR (mang may))) or (nang ma)) hoi. nhieu viec cac tro va trinh vai cua tre*.