Perhaps you should try some spelling variations:
doanh van » doan van, doanh ban, doanh nhan
cac thoi » cac toi, cac hop, cac tro
doanh va » doan va, doanh tai, doanh cua
thoi san » thi san, thai san, thoi sao
te sach » toc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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: te sach ky dang xa hoi. ((hieu ve) or (hieu va)) cac thoi san ((doanh van) OR (doanh va)) cua 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 thoi san ((doanh van) OR (doanh va)) cua 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 thoi san ((doanh van) OR (doanh va)) cua tre*".