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 chau", "nguyen chi minh chi"
"nguyen nhu minh khai" » "nguyen thi minh khai", "nguyen huu minh khai", "nguyen tu minh khai", "nguyen nhu minh khue", "nguyen nhu minh chau", "nguyen nhu minh chi", "nguyen thu minh khai", "nguyen nhu binh khai", "nguyen phu minh khai"
"nguyen huy minh khai" » "nguyen huu minh khai", "nguyen duy minh khai", "nguyen duc minh khai", "nguyen huy minh khue", "nguyen huy minh chau", "nguyen huy minh chi", "nguyen huy sinh khai"

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