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 khai" » "nguyen thi minh khai", "nguyen huu minh khai", "nguyen huy minh khai", "nguyen nhu minh chau", "nguyen nhu minh chi", "nguyen nhu minh pham", "nguyen thu minh khai", "nguyen nhu binh khai", "nguyen phu minh khai"
"nguyen duy minh khue" » "nguyen duc minh khue", "nguyen huu minh khue", "nguyen ly minh khue", "nguyen duy vinh khue", "nguyen duy binh khue", "nguyen duy minh hue", "nguyen duy minh khu", "nguyen duy minh khoe"

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 khai"))) or ("nguyen duy minh khue"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nguyen chi minh khai") OR ("nguyen nhu minh khai"))) OR ("nguyen duy minh khue")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nguyen chi minh khai\") OR (\"nguyen nhu minh khai\"))) or (\"nguyen duy minh khue\"))".
• Removing quotes may allow a broader search: (((( nguyen chi minh khai ) OR ( nguyen nhu minh khai ))) or ( nguyen duy minh khue )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen chi minh khai") OR ("nguyen nhu minh khai"))) or ("nguyen duy minh khue"))*.