Perhaps you should try some spelling variations:
thang long » thanh cong
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
hanh tran » hanh trang, thanh tran, hanh tram
dang cong » dung cong
tran van » luan van
van phan » van phong, van thanh, luan phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh tran van ((thang long) or (dang cong)) van phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh tran van ((thang long) OR (dang cong)) van phan tu*.