Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trinh vat » trinh van, trinh luat, sinh vat
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
tinh va » tich va, trinh van, tinh gia
ban cau » bang cau, ban can, van 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 ((tinh va) OR (trinh vat)) thong ((cong san) or (cong tan)) ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tinh va) OR (trinh vat)) thong ((cong san) OR (cong tan)) ban cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((tinh va) OR (trinh vat)) thong ((cong san) or (cong tan)) ban cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tinh va) OR (trinh vat)) thong ((cong san) or (cong tan)) ban cau*.