Perhaps you should try some spelling variations:
"su sach ha va giai bo thong minh" » "su sach ha va giai bo thong tin", "su sach ha va giai bo hoang minh", "su sach ha va giai pho thong minh", "su sach ha va giai bo truong minh", "su sach ha va giai he thong minh", "so sach ha va giai bo thong minh", "vu sach ha va giai bo thong minh", "su sach nha va giai bo thong minh", "su sach han va giai bo thong minh", "su sach xa va giai bo thong minh", "su sach ha va giai bai thong minh", "su sach ha va giai cao thong minh", "su sach ha va giai toa thong minh", "su sach ha van giai bo thong minh", "su sach hoa va giai bo thong minh"
"so mach cua ky giai tao thong minh" » "so mach cua ky giai tao thong tin", "so mach cua ky giai tao hoang minh", "so mach cua ky giai tao trong minh", "so mach cua ky giai giao thong minh", "so mach cua ky giai toan thong minh", "so manh cua ky giai tao thong minh", "so menh cua ky giai tao thong minh", "so hanh cua ky giai tao thong minh", "so mach cua ky giai cao thong minh", "so mach cua ky giai tai thong minh", "so mach cua ky gia tac thong minh", "so sach cua ky giai tao thong minh", "tao mach cua ky giai tao thong minh", "kon mach cua ky giai tao thong minh", "so mach cua ly giai tao thong minh", "so mach cua ke giai tao thong minh", "so mach cua kem giai tao thong minh"

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 ha va giai bo thong minh") or ("so mach cua ky giai tao thong minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach ha va giai bo thong minh") OR ("so mach cua ky giai tao thong minh")).
• Removing quotes may allow a broader search: (( su sach ha va giai bo thong minh ) or ( so mach cua ky giai tao thong minh )).
• Adding a wildcard symbol may retrieve word variants: (("su sach ha va giai bo thong minh") or ("so mach cua ky giai tao thong minh"))*.