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
dang cong » dung cong
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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 (tinh cua)) dang cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh quan) OR (tinh cua)) dang cong tan tran cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh quan) or (tinh cua)) dang cong tan tran cau*.