Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
trong dang » truong dang, trong dong, trong dung
trung tac » trung tam, trong tac, trung tai
trong dan » trong san, trong tan, trong ban
tac dung » sach dung, xay dung, tin dung
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 (chieu sach)) - thanh trung tac dung ((trong dan) OR (trong dang)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - thanh trung tac dung ((trong dan) OR (trong dang)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chieu sach)) - thanh trung tac dung ((trong dan) OR (trong dang)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - thanh trung tac dung ((trong dan) OR (trong dang)) toan cau*.