Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung quan » truong quan, trong quan, trung tuan
trong manh » trong minh, trong anh, trong canh
trong mach » trong cac, trong minh, trong anh
quan dung » quang dung, quan duong, qua dung
toan tap » toan ban

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 qua)) - thanh trung quan dung ((trong manh) OR (trong mach)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu qua)) - thanh trung quan dung ((trong manh) OR (trong mach)) toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu qua)) - thanh trung quan dung ((trong manh) OR (trong mach)) toan tap*".