Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung luan » truong luan, trung tuan, trung quan
chung cong » nhung cong, chong cong, chung thong
phung cong » nhung cong, phong cong, nhung chong
hieu lang » chieu sang, hieu quang, nhieu tang
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chinh sach)) - thanh trung luan ((chung cong) OR (phung cong)) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chinh sach)) - thanh trung luan ((chung cong) OR (phung cong)) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chinh sach)) - thanh trung luan ((chung cong) OR (phung cong)) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chinh sach)) - thanh trung luan ((chung cong) OR (phung cong)) tac toan tap*.