Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
dang xay » dang van, van xay
doanh va » doanh tai, doanh cua, hanh va
viec cac » vien cac, viec cua, viec lam
tu sach » thu sach, te sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky dang xay hoi. nhieu viec cac lo van ((doanh va) or (doan va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky dang xay hoi. nhieu viec cac lo van ((doanh va) OR (doan va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky dang xay hoi. nhieu viec cac lo van ((doanh va) or (doan va)) cua tre*".