Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
dung luong » dung thuong, dung phuong, dung truong
hieu lang » chieu sang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
luong tai » dung tai, luong va
cua dung » cua dang, cua dong, qua dung
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 ((chinh sach) OR (((hieu lang) OR (hieu quang)))) - thanh trung cua dung luong tai toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (((hieu lang) OR (hieu quang)))) - thanh trung cua dung luong tai toan tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (((hieu lang) OR (hieu quang)))) - thanh trung cua dung luong tai toan tap*.