Perhaps you should try some spelling variations:
kinh sach » dinh sach, tinh sach, chinh sach
sinh sach » chinh sach, sinh san, sang sach
dung cong » dung trong
san thanh » ban thanh, van thanh, son thanh
thanh ban » thanh san, thanh van, thanh bac
trang va » hang va
tran van » luan van
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((kinh sach) OR (sinh sach)) - hanh ((trang va) or (tran van)) dung cong san thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((kinh sach) OR (sinh sach)) - hanh ((trang va) OR (tran van)) dung cong san thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((kinh sach) OR (sinh sach)) - hanh ((trang va) or (tran van)) dung cong san thanh ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((kinh sach) OR (sinh sach)) - hanh ((trang va) or (tran van)) dung cong san thanh ban*.