Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trung tran » trung tuan, trung thanh, trung tam
tran thong » toan thong, tran hong, tran trong
thong tac » thong cac, tuong tac, thong tai
tac doan » tap doan, tan doan, thai doan
doan cau » toan cau, doan dau, doan cap

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 (hieu quang)) - thanh trung tran thong thong tac doan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu quang)) - thanh trung tran thong thong tac doan cau*.