Perhaps you should try some spelling variations:
"nguyen chi minh chi" » "nguyen thi minh chi", "nguyen can minh chi", "nguyen nhu minh chi", "nguyen chi dinh chi", "nguyen chi linh chi", "nguyen chi minh chau"
"nguyen huu minh khue" » "nguyen duc minh khue", "nguyen huu dinh khue", "nguyen huu manh khue", "nguyen huu binh khue"
"nguyen huy minh khoi" » "nguyen duy minh khoi", "nguyen duc minh khoi", "nguyen ly minh khoi", "nguyen huy minh khai", "nguyen huy sinh khoi", "nguyen huy minh hoi", "nguyen huy binh khoi"

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 huu minh khue") or ("nguyen huy minh khoi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chi minh chi") OR ((("nguyen huu minh khue") OR ("nguyen huy minh khoi")))).
• Removing quotes may allow a broader search: (( nguyen chi minh chi ) or ((( nguyen huu minh khue ) or ( nguyen huy minh khoi )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh chi") or ((("nguyen huu minh khue") or ("nguyen huy minh khoi"))))*.