Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
thieu xanh » chieu xanh, thien anh, thien danh
duong cong » dung cong, luong cong, duong trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dong cong » dung cong, dang cong, cong cong
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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: hoc ((thieu xanh) OR (hieu manh)) - canh tranh chua ((dong cong) OR (duong cong)) dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - canh tranh chua ((dong cong) or (duong cong)) dan than ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - canh tranh chua ((dong cong) or (duong cong)) dan than ban*.