Perhaps you should try some spelling variations:
doanh thanh » danh thanh, doanh nhan, dinh thanh
hoc thieu » toc thieu, hoc hien
thanh qua » thanh quan, thanh qui, hanh qua
dung cong » dung trong
doc hieu » toc thieu, hoc hien
qua dung » quang dung, su dung, qua song
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc thieu)) manh - doanh thanh qua dung cong ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) manh - doanh thanh qua dung cong ((tan toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) manh - doanh thanh qua dung cong ((tan toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) manh - doanh thanh qua dung cong ((tan toan) OR (tap toan)) cau*.