Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cua khong » hua khong, cua phuong, cua thuong
anh tang » anh bang, anh dang, anh nang
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 - ((anh tang) or (canh tranh)) cua khong cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((anh tang) OR (canh tranh)) cua khong cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((anh tang) or (canh tranh)) cua khong cong tap toan cao*.