Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
giao thanh » gia thanh, gian thanh, giay thanh
hieu vien » hieu hien, hieu viec, thieu nien
dung giao » nang giao
thanh vai » thanh hai, thanh van, thanh tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang xa » trang xa, tang ma, lang xa
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty tang xa hoi. ((hieu vien) or (nhieu viec)) sach dung giao thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. ((hieu vien) OR (nhieu viec)) sach dung giao thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. ((hieu vien) or (nhieu viec)) sach dung giao thanh vai cua tre*.