Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hanh hang » thanh hang, hang hang, hanh han
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan cau » phan dau, phan cac, phan tu
va dang » van dang, va lang, da dang
va nang » van nang, da nang, cam nang

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 sach - hanh hang ((va dang) OR (va nang)) ((cong dan) OR (cong san)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh hang ((va dang) or (va nang)) ((cong dan) OR (cong san)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh hang ((va dang) or (va nang)) ((cong dan) OR (cong san)) phan cau*.