Perhaps you should try some spelling variations:
"nguyen chi minh khai" » "nguyen can minh khai", "nguyen nhu minh khai", "nguyen hai minh khai", "nguyen chi minh chi", "nguyen chi minh pham", "nguyen chi minh thao"
"nguyen chi minh chau" » "nguyen can minh chau", "nguyen nhu minh chau", "nguyen hai minh chau", "nguyen chi tinh chat"
"nguyen thi minh khue" » "nguyen thi hanh khue", "nguyen thi bich khue", "nguyen thi minh hue", "nguyen thi minh khu", "nguyen thi minh khoe"

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