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