Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
sang luan » tang luan, san luan, bang luan
hang luan » tang luan, dung luan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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 - tinh ((sang luan) or (hang luan)) nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - tinh ((sang luan) OR (hang luan)) nhung cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - tinh ((sang luan) or (hang luan)) nhung cong tap toan cao*.