Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
bang cong » dang cong, bang song, hang cong
trung ca » trung cap, truong ca, trung cua
cong san » cong tac
ca bang » cao bang, can bang, cac bang
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (hieu quang)) - thanh trung ca bang cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - thanh trung ca bang cong san van ban.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quang)) - thanh trung ca bang cong san van ban*.