Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
toan ban » van ban

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 va thong cong dan ((((toan cao) OR (toan ban))) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh trinh va thong cong dan ((((toan cao) OR (toan ban))) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh va thong cong dan ((((toan cao) OR (toan ban))) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh trinh va thong cong dan ((((toan cao) OR (toan ban))) or (toan tap))*.