Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cua dang » cua ban
cua dong » chua dong, cua nong, cua song
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » 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 ((cua dang) or (((cua dong) or (cua cong)))) cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh ((cua dang) OR (((cua dong) OR (cua cong)))) cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh ((cua dang) or (((cua dong) or (cua cong)))) cong tap toan cau*.