Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
dong vai » dong tai, dong va, dong vat
viec cac » vien cac, viec cua, viec lam
tu sach » thu sach, su sach, tu cach
vai cuu » vai cua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van

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) OR (te sach)) ((ky lang) OR (ky tang)) xa hoi. nhieu viec cac lo van dong vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((ky lang) or (ky tang)) xa hoi. nhieu viec cac lo van dong vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((ky lang) or (ky tang)) xa hoi. nhieu viec cac lo van dong vai cuu tre*.