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 pham"
"nguyen nhu minh khai" » "nguyen thi minh khai", "nguyen huu minh khai", "nguyen huy minh khai", "nguyen nhu minh khue", "nguyen nhu minh chau", "nguyen nhu minh pham", "nguyen nhu binh khai", "nguyen phu minh khai", "nguyen nhat minh khai"
"nguyen thu minh chi" » "nguyen thi minh chi", "nguyen tu minh chi", "nguyen huu minh chi", "nguyen vu minh chi", "nguyen thu dinh chi", "nguyen thu linh chi", "nguyen thu 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 thu minh chi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chi minh khai") OR ((("nguyen nhu minh khai") OR ("nguyen thu minh chi")))).
• Removing quotes may allow a broader search: (( nguyen chi minh khai ) or ((( nguyen nhu minh khai ) or ( nguyen thu minh chi )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh khai") or ((("nguyen nhu minh khai") or ("nguyen thu minh chi"))))*.