Perhaps you should try some spelling variations:
"nguyen chi minh chi" » "nguyen can minh chi", "nguyen hai minh chi", "nguyen thu minh chi", "nguyen chi dinh chi", "nguyen chi linh chi", "nguyen chi minh chau"
"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 chi") 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 chi\") OR (((\"nguyen nhu minh khue\") OR (\"nguyen thi minh khue\"))))".
• Removing quotes may allow a broader search: (( nguyen chi minh chi ) OR ((( nguyen nhu minh khue ) OR ( nguyen thi minh khue )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh chi") OR ((("nguyen nhu minh khue") OR ("nguyen thi minh khue"))))*.