Perhaps you should try some spelling variations:
"nguyen chi minh khai" » "nguyen nhu minh khai", "nguyen hai minh khai", "nguyen thu minh khai", "nguyen chi minh chau", "nguyen chi minh chi", "nguyen chi minh pham"
"nguyen can minh khue" » "nguyen van minh khue", "nguyen xuan minh khue", "nguyen cong minh khue", "nguyen cao minh khue", "nguyen ban minh khue"
"nguyen thi minh khai" » "nguyen thi minh chau", "nguyen thi minh chi", "nguyen thi minh pham", "nguyen thi hanh khai", "nguyen thi bich khai"

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