Perhaps you should try some spelling variations:
"su sach phan mem gian do hoang minh" » "su sach han mem gian do hoang minh", "su mach phan mem gian do hoang minh", "su sach phat mem gian do hoang minh", "su sach phan mem quan do hoang minh", "su sach phan kem giai do hoang minh", "su sach phan dam gian do hoang minh", "su sach phan mem gian do hong minh", "su sach phan mem gian co hoang minh", "su sach phan mem gian duc hoang minh", "so sach phan mem gian do hoang minh", "vu sach phan mem gian do hoang minh", "su sach phan mem gian don hoang minh", "su sach phan mem gian doc hoang minh", "su sach phan mem gian o hoang minh"
"su cao cua ke giai giao thong tin" » "su cao cua ke gioi giao thong tin", "su cao cua ke ngoai giao thong tin", "su cao cua ke giai cao thong tin", "su ca cua ke giai giao thong tin", "su co cua ke giai giao thong tin", "su cau cua ke giai giao thong tin", "su cao cua kem giai giao thong tin", "su cao cua de giai giao thong tin", "su cao cua ke giao giao thong tin", "cu cao cua ke giai giao thong tin", "vu cao cua ke giai giao thong tin", "su cao cua ky giai giao thong tin", "su cao cua te giai giao thong tin", "su cao bua ke giai giao thong tin", "su cao cua ke giai giao trong tin", "su cao cua ke giai giao 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 phan mem gian do hoang minh") or ("su cao cua ke giai giao thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach phan mem gian do hoang minh") OR ("su cao cua ke giai giao thong tin")).
• Removing quotes may allow a broader search: (( su sach phan mem gian do hoang minh ) or ( su cao cua ke giai giao thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("su sach phan mem gian do hoang minh") or ("su cao cua ke giai giao thong tin"))*.