Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trung tac » trung tam, trong tac, trung tai
dong cong » duong cong, dung cong, dang cong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
tac dong » tac dung, tac trong, ha dong
toan cau » 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: ho ((chieu sang) or (hieu lang)) - thanh trung tac dong cong vang toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh trung tac dong cong vang toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - thanh trung tac dong cong vang toan cau*.