Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
khanh luan » khanh thuan, doanh luan, hang luan
dong thong » thong thong, nong thon, dong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
quan doan » quan hoang, chuan doan, chan doan
doan cap » doanh cao, dan ca, toan cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu sach)) - khanh luan van dong thong quan doan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sach)) - khanh luan van dong thong quan doan cap*.