Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
doi chieu » doc hieu, doi chi, ho chieu
trinh cua » tinh cua, trinh luat, trinh luan
dang cong » dung cong
cong vang » cong lang, cong quang, cong ngang
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 cua) OR (trinh quan)) dang cong vang ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh cua) OR (trinh quan)) dang cong vang ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trinh cua) OR (trinh quan)) dang cong vang ((phan cau) or (phan dau))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh cua) OR (trinh quan)) dang cong vang ((phan cau) or (phan dau))*.