Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
mot chieu » ho chieu
doi chieu » doc hieu, doi chi, ho chieu
trinh ve » trinh he, trinh va, trinh vi
ve nhung » va nhung, tu nhung
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (doi chieu)) sach - hanh trinh ve nhung cong ((san toan) OR (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doi chieu)) sach - hanh trinh ve nhung cong ((san toan) OR (dan toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chieu)) sach - hanh trinh ve nhung cong ((san toan) OR (dan toan)) cau*".