Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
doi chieu » doc hieu, doi chi, mot chieu
luan cong » luat cong, luong cong, luan chung
tran cong » tran hong, trien cong, tran hoang
dan thi » dang thi, tran thi, dinh thi

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 trung ((luan cong) or (tran cong)) trong cac dan thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh trung ((luan cong) OR (tran cong)) trong cac dan thi*.