Perhaps you should try some spelling variations:
trung thanh » truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
trung tuan » trung tam, tran tuan, truong thanh
hoc thieu » toc thieu, hoc hien
trong tan » trong quan, trong cac, trong ca
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh ((trung tuan) OR (trung thanh)) dung trong tan than cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh ((trung tuan) or (trung thanh)) dung trong tan than cau*.