Perhaps you should try some spelling variations:
chiet tach » chieu sach
cong quan » cuong quan, cong quang, hong quan
tong quan » thong quan, tong luan, luong quan
dung cong » dung trong
ho chiet » ho chieu, ho thiet, hoc thiet
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, 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: ho chiet tach - thanh ((cong quan) OR (tong quan)) dung cong tac than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - thanh ((cong quan) OR (tong quan)) dung cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh ((cong quan) OR (tong quan)) dung cong tac than cau*.