Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thanh » truong thanh
dung thuong » dung trong, hang thuong, cong thuong
chieu sang » chieu sach, chieu xanh, hieu lang
dung tuong » dung truong, dung trong, dung luong
doi chieu » doc hieu, doi chi, ho chieu
dan toan » van toan, dan than, manh 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 sang - thanh trung thanh ((dung tuong) or (dung thuong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung thanh ((dung tuong) OR (dung thuong)) dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung thanh ((dung tuong) or (dung thuong)) dan toan cau*.