Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
tang qua » tang quan, tang cua, tang quy
qua dung » quang dung, su dung, qua song
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
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: theo tieu xanh - anh tang qua dung cong ((((dan toan) or (dan than))) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - anh tang qua dung cong ((((dan toan) OR (dan than))) OR (tap toan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - anh tang qua dung cong ((((dan toan) or (dan than))) or (tap toan)) cau*.