Perhaps you should try some spelling variations:
thanh trung » thanh tung
mot chieu » doi chieu, ho chieu
trung cao » truong cao, trung cap, trung co
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cao dung » cao dang, cao dong, cao ung
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (mot chieu)) sach - thanh trung cao dung cong ((dan than) or (dan chan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (mot chieu)) sach - thanh trung cao dung cong ((dan than) OR (dan chan)) cao.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (mot chieu)) sach - thanh trung cao dung cong ((dan than) or (dan chan)) cao*.