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 khue", "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 khue", "nguyen nhu minh chi", "nguyen nhu minh pham", "nguyen thu minh khai", "nguyen nhu binh khai", "nguyen phu minh khai"
"nguyen nhu minh chau" » "nguyen thi minh chau", "nguyen huu minh chau", "nguyen huy minh chau", "nguyen nhu tinh chat", "nguyen thu minh chau", "nguyen nhu binh chau", "nguyen phu minh chau"

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