Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
phan hieu » van hieu, phan kien, gian hieu
quang van » quang ban, quan van, quang uan
van thong » van thuong, van phong, va thong
tong luan » tang luan, dung luan, hang luan
cong luan » cong tuan, dong luan, cong luong

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

• Performing a fuzzy search may retrieve terms with similar spellings: phan hieu quang - nhanh quang van thong ((tong luan) or (cong luan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phan hieu quang - nhanh quang van thong ((tong luan) OR (cong luan)) van ban*.