Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
cong tuan » cong tan, cong luan, cong thanh
trinh va » trinh van, trinh vat, trinh ve
co sach » bo sach, cuon sach, hoc sach
ban ban » ban banh, van ban, ban can
ban dan » ban hang, ban hanh, ban quan
can ban » van ban, toan ban
doi co » doi bo, moi co, hoi co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi co sach - hanh trinh va nhung cong tuan ((((ban ban) OR (ban dan))) or (can ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi co sach - hanh trinh va nhung cong tuan ((((ban ban) OR (ban dan))) OR (can ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi co sach - hanh trinh va nhung cong tuan ((((ban ban) OR (ban dan))) or (can ban))".
• Adding a wildcard symbol may retrieve word variants: doi co sach - hanh trinh va nhung cong tuan ((((ban ban) OR (ban dan))) or (can ban))*.