Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung phan » trung thanh, trung ha, dung phan
phan quang » pham quang, phan quan, nhanh quang
doi chieu » doc hieu, doi chi, mot chieu
dang van » hoang van, hang va
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 phan quang ((dung va) or (dang van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung phan quang ((dung va) OR (dang van)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung phan quang ((dung va) or (dang van)) toan cao*.