Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cua nang » chua nang, cua dang, cua hang
song dan » song danh, song van, cong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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) or (anh tang)) cua nang song dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((canh tranh) OR (anh tang)) cua nang song dan toan cao*.