Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, nhung don
doi chieu » doc hieu, doi chi, mot chieu
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
trinh ve » trinh he, trinh va, trinh vi
ban can » ban dan, ban hang, ban hanh

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) or (ho chieu)) sach - hanh trinh ve ((nhung cong) or (hang cong)) van ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - hanh trinh ve ((nhung cong) OR (hang cong)) van ban can.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) sach - hanh trinh ve ((nhung cong) or (hang cong)) van ban can*.