Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
nhiet nang » nhiet dong, viet nang, nhieu tang
viet hoang » viet huong, viet hung, viet thong
trung cua » truong cua, trung tuan, trung cap
cong cong » cong dong, trong cong, dung cong
cong san » cong tac
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: hoc ((chiet tach) or (((nhiet nang) or (viet hoang)))) - thanh trung cua cong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (((nhiet nang) OR (viet hoang)))) - thanh trung cua cong cong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (((nhiet nang) or (viet hoang)))) - thanh trung cua cong cong san van ban*.