Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
doanh cua » doanh luan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
tuc vay » tuc va, tu vay, tuc xay
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
hieu ve » hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xa hoi. ((hieu ve) OR (hieu va)) cac tuc vay doanh cua ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. ((hieu ve) OR (hieu va)) cac tuc vay doanh cua ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. ((hieu ve) OR (hieu va)) cac tuc vay doanh cua ((cua tre) or (cuu tre))*".