Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
tung quang » tuong quang, dung quang, hung quang
quang dung » quang trung, ung dung, cuong dung
dong thanh » truong thanh
dung dong » dung cong, vung dong, dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - thanh tung quang dung dong thanh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh tung quang dung dong thanh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh tung quang dung dong thanh ((toan cao) or (toan ban))*.