Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
dung luong » dung thuong, dung phuong, dung truong
hieu lang » chieu sang, hieu quang, nhieu tang
quan dung » quang dung, quan duong, qua dung
luong tai » dung tai, luong va
tai toan » bai toan, tap toan, tai tuan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (hieu lang)) - ((thanh trung) OR (thanh tung)) quan dung luong tai toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu lang)) - ((thanh trung) OR (thanh tung)) quan dung luong tai toan tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu lang)) - ((thanh trung) OR (thanh tung)) quan dung luong tai toan tap*.