Perhaps you should try some spelling variations:
cuong cong » cong cong, luong cong, duong cong
hieu lang » chieu sang, hieu quang, nhieu tang
toc hieu » toc thieu, doc hieu, hoc thieu
tra xuan » tran xuan, tra quan, tran tuan
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu lang - thanh ((tra xuan) or (tran van)) cuong cong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - thanh ((tra xuan) OR (tran van)) cuong cong dan khan cap*.