Perhaps you should try some spelling variations:
"nguyen hai minh khai" » "nguyen van minh khai", "nguyen huu minh khai", "nguyen can minh khai", "nguyen hai minh khue", "nguyen hai minh chi", "nguyen hai minh pham", "nguyen khai minh khai", "nguyen thai minh khai", "nguyen hai linh khai"
"nguyen thi minh khai" » "nguyen thi minh khue", "nguyen thi minh chi", "nguyen thi minh pham", "nguyen chi minh khai", "nguyen thi hanh khai", "nguyen thi bich khai"
"nguyen thi minh chau" » "nguyen thi tinh chat", "nguyen chi minh chau", "nguyen thi hanh chau", "nguyen thi bich 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 hai minh khai") or ((("nguyen thi minh khai") or ("nguyen thi minh chau"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen hai minh khai") OR ((("nguyen thi minh khai") OR ("nguyen thi minh chau")))).
• Removing quotes may allow a broader search: (( nguyen hai minh khai ) or ((( nguyen thi minh khai ) or ( nguyen thi minh chau )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen hai minh khai") or ((("nguyen thi minh khai") or ("nguyen thi minh chau"))))*.