Perhaps you should try some spelling variations:
"su sach dao ve nguoi tay thang tien" » "su sach dao ve nguoi tay toan tien", "su sach dao ve nguoi tay thanh vien", "su sach dao ve nguoi tay bang tien", "su sach dao ve nguoi thai thang tien", "su sach dao ve nguoi tat thang tien", "su sach dao ve nguoi tay tang tien", "su sach dao ve nguoi toan thang tien", "su lanh dao ve nguoi tay thang tien", "su sach dao va nguoi tay thang tien", "su sach dao le nguoi tay thang tien", "su sach dao ve nguon tay thang tien", "so sach dao ve nguoi tay thang tien", "vu sach dao ve nguoi tay thang tien", "su sach bao ve nguoi tay thang tien", "su sach dap ve nguoi tay thang tien", "su sach dau ve nguoi tay thang tien"
"su sach che my giai bon thong tin" » "su sach che my giai bon thuong tin", "su sach che my giai bo thong tin", "su sach che my giai ban thong tin", "su sach thue my giai bon thong tin", "su sach nha my giai bon thong tin", "su sach cap my giai bon thong tin", "su sach che my gioi bon thong tin", "su sach che my giai doan thong tin", "su sach che my giai bai thong tin", "so sach che my giai bon thong tin", "vu sach che my giai bon thong tin", "su sach che ly giai bon thong tin", "su sach che me giai bon thong tin", "su sach che my giao bon thong tin"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("su sach che my giai bon thong tin") or ("su sach dao ve nguoi tay thang tien"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach che my giai bon thong tin") OR ("su sach dao ve nguoi tay thang tien")).
• Removing quotes may allow a broader search: (( su sach che my giai bon thong tin ) or ( su sach dao ve nguoi tay thang tien )).
• Adding a wildcard symbol may retrieve word variants: (("su sach che my giai bon thong tin") or ("su sach dao ve nguoi tay thang tien"))*.