Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doanh hoan » doanh doanh, doanh khoa, doanh nhan
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
hoan cua » hoa cua, toan cua, han cua
phan dau » 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 - doanh hoan cua ((nhung cong) OR (thong cong)) dan ((phan dau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - doanh hoan cua ((nhung cong) OR (thong cong)) dan ((phan dau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - doanh hoan cua ((nhung cong) OR (thong cong)) dan ((phan dau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - doanh hoan cua ((nhung cong) OR (thong cong)) dan ((phan dau) or (phan tu))*.