Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu xanh » chieu sach, chieu sang, chieu tinh
thuc phung » thuc chung, thuc nhung, thu phuong
phung cong » nhung cong, phong cong, nhung chong
hieu lang » chieu sang, nhieu tang, hieu van
toan thuc » toan hoc, dan thuc, nhan thuc
cong chan » cong nhan, cong chat, cong khan
chan nhan » chan nan, chau nhan, thanh nhan
nhan cach » phan cac

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: hoc ((chieu xanh) OR (((hieu lang) OR (hieu quang)))) - tinh toan thuc phung cong chan nhan cach~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (((hieu lang) OR (hieu quang)))) - tinh toan thuc phung cong chan nhan cach~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (((hieu lang) OR (hieu quang)))) - tinh toan thuc phung cong chan nhan cach*.