Perhaps you should try some spelling variations:
hanh trinh » canh tranh
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
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) or (hoc thieu)) sach - ((hanh trinh) or (hanh chinh)) va nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) sach - ((hanh trinh) OR (hanh chinh)) va nhung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) sach - ((hanh trinh) or (hanh chinh)) va nhung cong san toan ban*.