Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung lung » trung dung, trung hung, trung long
hieu lang » chieu sang, hieu quang, nhieu tang
lung dung » luong dung, ung dung, dung dung
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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: hoc ((chieu sach) OR (hieu lang)) - thanh trung lung dung cong dan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (hieu lang)) - thanh trung lung dung cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (hieu lang)) - thanh trung lung dung cong dan than cap*.