Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
quang dung » quang trung, ung dung, cuong dung
trong manh » trong minh, trong anh, trong mach
manh toan » thanh toan, anh tuan, tinh toan
qua dung » su dung, qua song, qua cong
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 ((qua dung) OR (quang dung)) trong manh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu qua)) - thanh trung ((qua dung) OR (quang dung)) trong manh toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu qua)) - thanh trung ((qua dung) OR (quang dung)) trong manh toan tap*".