Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tran xuan » tran quang
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
tran van » luan van
cong dat » cong dan, dong dat, cong da

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 ((tran xuan) or (tran van)) cong cong dat khanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh ((tran xuan) OR (tran van)) cong cong dat khanh cap*.