Perhaps you should try some spelling variations:
thanh chuong » thanh huong, thanh cong, nhanh chong
chiet tach » chieu sach
chuong cao » truong cao, cuong cac, luong cao
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cao nhung » cho nhung, cam nhung, cao chung
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (chiet tach)) - thanh chuong cao nhung cong ((tap toan) OR (tap quan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (chiet tach)) - thanh chuong cao nhung cong ((tap toan) OR (tap quan)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu manh) or (chiet tach)) - thanh chuong cao nhung cong ((tap toan) OR (tap quan)) tap*".