Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan 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 ((tran tuan) or (trung thanh)) dung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - thanh ((tran tuan) OR (trung thanh)) dung cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - thanh ((tran tuan) or (trung thanh)) dung cong tap toan cau*.