Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chinh thuc » chinh phuc, hinh thuc, trinh thuc
doi chieu » doc hieu, doi chi, ho chieu
thuc dung » thuoc dung, thuy dung, tuc dung
dung cong » dung trong
cong san » cong tac
toan cao » toan tap
toan tai » toan tap, doanh tai, von tai
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: doi chieu sang - hanh chinh thuc dung cong san ((((toan cao) OR (toan tai))) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh chinh thuc dung cong san ((((toan cao) or (toan tai))) or (toan ban))*.