Perhaps you should try some spelling variations:
doanh van » doanh va, doanh ban, doanh nhan
dang hoa » dang hoai, dang khoa, dong hoa
doan van » doan va, hoang van, luan van
te sach » toc sach
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cac tuc » cac tu, cac tac, cac nuoc
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dang » ky nang, ky danh

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 hoa hoi. hieu ve ((cac tuc) OR (cac toc)) vay ((doanh van) or (doan van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang hoa hoi. hieu ve ((cac tuc) OR (cac toc)) vay ((doanh van) OR (doan van)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang hoa hoi. hieu ve ((cac tuc) OR (cac toc)) vay ((doanh van) or (doan van)) cua tre*".