Perhaps you should try some spelling variations:
cong hoang » cong hoan, thong hoang, vuong hoang
chieu sach » chinh sach, chiet tach, chieu sang
cho chieu » ho chieu, theo chieu, chon chien
nang quan » ban quan, nang suat
dung cong » dung trong
hoang van » hang va
tang qua » tang quan, tang cua, tang quy

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho chieu sach - hanh ((tang qua) or (nang quan)) dung cong hoang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho chieu sach - hanh ((tang qua) OR (nang quan)) dung cong hoang van ban.
• Adding a wildcard symbol may retrieve word variants: cho chieu sach - hanh ((tang qua) or (nang quan)) dung cong hoang van ban*.