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 thu minh khai" » "nguyen thi minh khai", "nguyen nhu minh khai", "nguyen tu minh khai", "nguyen thu minh khue", "nguyen thu minh chau", "nguyen thu minh chi", "nguyen chi minh khai", "nguyen vu minh 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 thu minh 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 thu minh khai")).
• Removing quotes may allow a broader search: (((( nguyen can minh khai ) or ( nguyen van minh khai ))) or ( nguyen thu minh khai )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen can minh khai") or ("nguyen van minh khai"))) or ("nguyen thu minh khai"))*.