Perhaps you should try some spelling variations:
doanh cua » doanh luan
doanh co » doanh va, anh co, nganh co
tu sach » thu sach, su sach, te sach
xuc vay » xuc hay
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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 ky dang xa hoi. ((hieu va) OR (lieu va)) cam xuc vay ((doanh co) OR (doanh cua)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. ((hieu va) or (lieu va)) cam xuc vay ((doanh co) OR (doanh cua)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. ((hieu va) or (lieu va)) cam xuc vay ((doanh co) OR (doanh cua)) cua tre*.