Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cong cong » cong dong, trong cong, dung cong
dat khanh » van khanh, duy khanh
khanh cap » hanh cap, khan cap, hanh cac
doc hieu » toc thieu, hoc thieu, hoc hien
tra xuan » tran xuan, tra quan, tran tuan
cong dat » cong dan, dong dat, cong da
lan van » luan van, lang van, tan van

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

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