Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thang cua » thong cua, hang cua, than cua
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cong tran » cong tan, cong tuan, cong toan
doc hieu » toc thieu, hoc thieu, hoc hien
tran van » luan 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 quang - hanh ((thang cua) or (trung cua)) dung cong tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu quang - hanh ((thang cua) OR (trung cua)) dung cong tran van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - hanh ((thang cua) or (trung cua)) dung cong tran van ban*.