Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
tang qua » tang quan, tang cua, tang quy
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) or (chieu xanh)) - anh tang qua dung cong ((van toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - anh tang qua dung cong ((van toan) OR (manh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - anh tang qua dung cong ((van toan) or (manh toan)) cao*.