Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
dang cong » dung cong
chinh ca » chinh ta, chinh va, chinh tai
ca dang » cao dang, cua dang, cac dang
cong so » cong san, cong hoa
so pham » son pham, su pham, so phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chieu sang)) - hanh chinh ca dang cong so pham van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh chinh ca dang cong so pham van.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh chinh ca dang cong so pham van*.