Perhaps you should try some spelling variations:
"nguyen chi minh khai" » "nguyen thi minh khai", "nguyen can minh khai", "nguyen hai minh khai", "nguyen chi minh chau", "nguyen chi minh chi", "nguyen chi minh pham"
"nguyen nhu minh khue" » "nguyen thi minh khue", "nguyen huu minh khue", "nguyen huy minh khue", "nguyen thu minh khue", "nguyen nhu binh khue", "nguyen nhat minh khue"
"nguyen phu minh khoi" » "nguyen phuc minh khoi", "nguyen thu minh khoi", "nguyen thuy minh khoi", "nguyen phu sinh khoi", "nguyen phu minh hoi", "nguyen phu trinh khoi", "nguyen phu ninh khoi", "nguyen phu tinh khoi"

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

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