Perhaps you should try some spelling variations:
"su sach cha ke nguoi cong phuong tien" » "su sach cha ke nguoi cong phuong trinh", "su sach cha ke nguoi cong thuong tien", "su sach cha ke nguoi cong huong tien", "su sach cha ke nguoi dong phuong tien", "su sach cha ke nguoi muong phuong tien", "su sach cha ke nguoi thong phuong tien", "su sach cha ke nguoi nung phuong tien", "su sach nha ke nguoi cong phuong tien", "su sach che ke nguoi cong phuong tien", "su sach ha ke nguoi cong phuong tien", "su sach cha le nguoi cong phuong tien", "su sach cha ky nguoi cong phuong tien", "su sach cha me nguoi cong phuong tien", "so sach cha ke nguoi cong phuong tien", "vu sach cha ke nguoi cong phuong tien", "su sach kha ke nguoi cong phuong tien"
"su sach ca ke nguoi cong thong tin" » "su sach ca ke nguoi muong thong tin", "su sach ca ke nguoi thong thong tin", "su sach ca ke nguoi nung thong tin", "su sach ca ke nguoi cong thuong tin", "su sach ca ke nguoi cong trong tin", "su sach ca ke nguoi dong thong tin", "su sach ca le nguoi cong thong tin", "su sach ca ky nguoi cong thong tin", "su sach ca me nguoi cong thong tin", "so sach ca ke nguoi cong thong tin", "vu sach ca ke nguoi cong thong tin", "su sach cap ke nguoi cong thong tin", "su sach cua ke nguoi cong thong tin", "su sach xa ke nguoi cong thong tin", "su sach cac ke nguoi cong thong tin", "su sach ca ve nguoi cong thong tin", "su sach ca ke nguoi cong thong tinh"

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 cha ke nguoi cong phuong tien") or ("su sach ca ke nguoi cong thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach cha ke nguoi cong phuong tien") OR ("su sach ca ke nguoi cong thong tin")).
• Removing quotes may allow a broader search: (( su sach cha ke nguoi cong phuong tien ) or ( su sach ca ke nguoi cong thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("su sach cha ke nguoi cong phuong tien") or ("su sach ca ke nguoi cong thong tin"))*.