Perhaps you should try some spelling variations:
"nguyen can minh khai" » "nguyen xuan minh khai", "nguyen cong minh khai", "nguyen manh minh khai", "nguyen can minh khue", "nguyen can minh chau", "nguyen can minh chi", "nguyen cao minh khai", "nguyen ban minh khai", "nguyen dan minh khai"
"nguyen phu tinh khai" » "nguyen phuc tinh khai", "nguyen nhu tinh khai", "nguyen thu tinh khai", "nguyen phu trinh khai", "nguyen phu tinh thai", "nguyen phu tinh hai", "nguyen phu ninh khai", "nguyen chau tinh khai", "nguyen khun tinh khai"
"nguyen van minh khai" » "nguyen van minh khue", "nguyen van minh chau", "nguyen van minh chi"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("nguyen can minh khai") or ("nguyen van minh khai"))) or ("nguyen phu tinh khai"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nguyen can minh khai") OR ("nguyen van minh khai"))) OR ("nguyen phu tinh khai")).
• Removing quotes may allow a broader search: (((( nguyen can minh khai ) or ( nguyen van minh khai ))) or ( nguyen phu tinh khai )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen can minh khai") or ("nguyen van minh khai"))) or ("nguyen phu tinh khai"))*.