Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
dang toan » dang tran, dan toan, dung toan
qua dung » quang dung, su dung, qua song
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - canh tranh qua dung cong ((van toan) or (dang toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh qua dung cong ((van toan) OR (dang toan)) cau*.