Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung cua » truong cua, trung tuan, trung cap
trong van » trong cac
cua dung » cua dang, cua dong, qua dung
van than » van thanh, van thang, van tuan
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (thieu quang)) - thanh trung cua dung trong van than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thieu quang)) - thanh trung cua dung trong van than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thieu quang)) - thanh trung cua dung trong van than cap*.