Perhaps you should try some spelling variations:
duong truong » duong trong, truong trung, tang truong
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
quan trong » gian trong
trung thuc » trong thuc, trang thuc, thuong thuc
thuc toan » thuc trang, thuat toan, thuc thanh
ho chieu » theo chieu, hoc thieu, doi chieu
toan ban » van 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 sang - thanh trung ((quan trong) OR (duong truong)) trung thuc toan ban~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung ((quan trong) or (duong truong)) trung thuc toan ban*.