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
dung cong » dung trong
trung ap » trung cap, trung lap, trung tam
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat
ap dung » xay dung, van dung

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 ap dung cong ((dan than) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung ap dung cong ((dan than) OR (dan chan)) cau*.