Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh han
trinh than » trinh thanh, trinh han, trinh toan
doi chieu » doc hieu, doi chi, ho chieu
dong cong » duong cong, dung cong, dang cong
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh ((trinh quan) or (trinh luat)) dong cong trinh than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh quan) OR (trinh luat)) dong cong trinh than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh quan) or (trinh luat)) dong cong trinh than cau*.