Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trung cao » truong cao, trung cap, trung ca
dung cong » dung trong
trung co » trung bo, trong co, truong cao
dan toan » van toan, dan than, manh toan
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu xanh - thanh ((trung cao) OR (trung co)) dung cong ((dan toan) or (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - thanh ((trung cao) OR (trung co)) dung cong ((dan toan) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - thanh ((trung cao) OR (trung co)) dung cong ((dan toan) or (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - thanh ((trung cao) OR (trung co)) dung cong ((dan toan) or (ban than)) cao*.