Perhaps you should try some spelling variations:
phong chong » thong thong
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
tran van » luan van
quan van » luan van, quan va, quan luan
tac than » tac thanh, tam than, tac nhan
than cap » khan cap, thanh lap, thanh cac

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) or (quan van)) ((phong chong) or (trong cong)) tac than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tran van) OR (quan van)) ((phong chong) OR (trong cong)) tac than cap.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tran van) or (quan van)) ((phong chong) or (trong cong)) tac than cap*.