Perhaps you should try some spelling variations:
chong cong » cong cong, thong cong, cuong cong
hoc thieu » hoc hien
cua chong » cua cong, cua chung, cua khong
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) OR (toc thieu)) xanh - ((anh tang) or (canh tranh)) cua chong cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) xanh - ((anh tang) OR (canh tranh)) cua chong cong tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) xanh - ((anh tang) or (canh tranh)) cua chong cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) xanh - ((anh tang) or (canh tranh)) cua chong cong tap toan cao*.