Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
trung qua » trung quan, trong qua, trung cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
qua dung » quang dung, su dung, qua song
tan toan » tap toan, van toan, dan toan

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) or (doc hieu)) xanh - thanh trung qua dung cong ((tan toan) OR (tan tran)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) xanh - thanh trung qua dung cong ((tan toan) OR (tan tran)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doc hieu)) xanh - thanh trung qua dung cong ((tan toan) OR (tan tran)) cao*".