Perhaps you should try some spelling variations:
chieu quang » hieu quang, thieu quang, chu quang
thanh trung » thanh tung
chong phap » phuong phap
trung cao » truong cao, trung cap, trung co
cong pham » cong phan, cong ha, cong hai
ho chieu » theo chieu, hoc thieu, mot chieu
cao dung » cao dang, cao dong, cao ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu quang - thanh trung cao dung ((cong pham) or (chong phap)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu quang - thanh trung cao dung ((cong pham) OR (chong phap)) van ban.
• Adding a wildcard symbol may retrieve word variants: ho chieu quang - thanh trung cao dung ((cong pham) or (chong phap)) van ban*.