Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
dien sach » dien anh
kien sach » kien mac, viet sach, kien lich
trong van » trong cac
dong cong » duong cong, dung cong, dang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((kien sach) OR (vien bach))) or (dien sach)) - thanh trong van dong cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((kien sach) OR (vien bach))) OR (dien sach)) - thanh trong van dong cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((kien sach) OR (vien bach))) or (dien sach)) - thanh trong van dong cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((((kien sach) OR (vien bach))) or (dien sach)) - thanh trong van dong cong dan than cao*.