Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
xang cong » bang cong, hang cong, nang cong
dang cong » dung cong
dan chan » dan gian, dan ca, van chat
doan* » doanh*, toan*, soan*

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((thanh trung) or (canh tranh)) chua ((xang cong) OR (dang cong)) dan chan doan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((thanh trung) OR (canh tranh)) chua ((xang cong) OR (dang cong)) dan chan doan*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((thanh trung) or (canh tranh)) chua ((xang cong) OR (dang cong)) dan chan doan*".