Perhaps you should try some spelling variations:
trong thuoc » trung thuoc, trong thuong, trong cuoc
chieu sach » chinh sach, chiet tach, chieu sang
trong thuc » trong thu, thuong thuc, trong thuat
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong ta » cong tac, cong tan, cong tai
ta van » tan van, tap van, va van

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 - sinh ((trong thuoc) or (trong thuc)) dung cong ta van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - sinh ((trong thuoc) OR (trong thuc)) dung cong ta van ban*.