Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, nhiet nang
thuc phung » thuc chung, thuc nhung, thu phuong
phung cong » nhung cong, phong cong, nhung chong
hieu lang » chieu sang, hieu quang, 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 sach) OR (nhieu tang))) OR (hieu lang)) - tinh toan thuc phung cong chan nhan cach~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sach) or (nhieu tang))) or (hieu lang)) - tinh toan thuc phung cong chan nhan cach*.