Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
canh tran » canh tranh, hanh trang, banh trang
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
doan phan » doanh phan, toan phan, dan phan
phan cach » nhan cach, phan cac, phan tach
doi hieu » doi chieu, doc hieu, doi 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: doi hieu lang - canh tran van ((hang cong) or (bang cong)) doan phan cach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh tran van ((hang cong) OR (bang cong)) doan phan cach*.