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 khue", "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 chi" » "nguyen thi hanh chi", "nguyen thi bich chi", "nguyen thi dinh chi", "nguyen thi linh chi", "nguyen thi minh thu"

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 chi"))~.
• 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 chi")).
• Removing quotes may allow a broader search: (((( nguyen chi minh khai ) or ( nguyen chi minh chau ))) or ( nguyen thi minh chi )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen chi minh khai") or ("nguyen chi minh chau"))) or ("nguyen thi minh chi"))*.