Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu viec » nhieu viec, hieu ve, sieu viet
doanh cua » doanh luan
dang xay » dang van, van xay
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cac duc » cac du, cao duc, cac dac
cua cua » cua chua, ca cua, qua 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 ky dang xay hoi. ((dieu hien) or (hieu viec)) cac duc va doanh cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((dieu hien) OR (hieu viec)) cac duc va doanh cua cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((dieu hien) or (hieu viec)) cac duc va doanh cua cua tre*.