Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
hanh trinh » canh tranh, hanh chinh
toan thang » toan thong, thanh thang, tran thanh
thang long » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 hien)) sach - hanh trinh toan thang long ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc hien)) sach - hanh trinh toan thang long ((dan toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc hien)) sach - hanh trinh toan thang long ((dan toan) or (van toan)) cau*.