Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu sach » chieu sach, hieu cach, dien sach
trinh hoa » trinh do, trinh han
hoa thong » hoa trong, hoa khong, hoa thon
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - hanh trinh hoa thong ((huong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh trinh hoa thong ((huong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh trinh hoa thong ((huong dan) or (cong san)) toan cao*.