Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
van nhung » van nhuong, va nhung, van hung
ho chieu » theo chieu, hoc thieu, mot chieu
cong van » cong vang, cong san, song van
van bao » van ban, van dao

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