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 phu minh khue"
"nguyen phu sinh khoa" » "nguyen phuc sinh khoa", "nguyen thu sinh khoa", "nguyen thuy sinh khoa", "nguyen phu sinh hoc", "nguyen phu sinh hoat", "nguyen phu anh khoa", "nguyen phau sinh khoa", "nguyen phu ninh khoa", "nguyen phu tinh khoa"

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 sinh khoa"))))~.
• 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 sinh khoa")))).
• Removing quotes may allow a broader search: (( nguyen chi minh khai ) or ((( nguyen nhu minh khue ) or ( nguyen phu sinh khoa )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh khai") or ((("nguyen nhu minh khue") or ("nguyen phu sinh khoa"))))*.