Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
trung cao » truong cao, trung cap, trung co
dung cong » dung trong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

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