Perhaps you should try some spelling variations:
"nguyen chi minh khai" » "nguyen can minh khai", "nguyen hai minh khai", "nguyen thu minh khai", "nguyen chi minh chau", "nguyen chi minh chi", "nguyen chi minh pham"
"nguyen nhu minh khue" » "nguyen huu minh khue", "nguyen huy minh khue", "nguyen tu minh khue", "nguyen thu minh khue", "nguyen nhu binh khue", "nguyen phu minh khue"
"nguyen thi minh khue" » "nguyen thi hanh khue", "nguyen thi bich khue"

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