Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung toan » truong toan, trung tuan, trung tran
hieu van » hieu va, thien van, lieu va
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 van)) - thanh trung toan thong ((cong tan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu van)) - thanh trung toan thong ((cong tan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - thanh trung toan thong ((cong tan) or (cong san)) toan cau*.