Perhaps you should try some spelling variations:
"nguyen can minh chau" » "nguyen van minh chau", "nguyen xuan minh chau", "nguyen cong minh chau", "nguyen can tinh chat", "nguyen cao minh chau", "nguyen ban minh chau"
"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 lich thai", "nguyen thi bich ha", "nguyen thi bien 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 can minh chau") or ((("nguyen thi minh khai") OR ("nguyen thi bich khai"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen can minh chau") OR ((("nguyen thi minh khai") OR ("nguyen thi bich khai")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen can minh chau\") or (((\"nguyen thi minh khai\") OR (\"nguyen thi bich khai\"))))".
• Removing quotes may allow a broader search: (( nguyen can minh chau ) or ((( nguyen thi minh khai ) OR ( nguyen thi bich khai )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen can minh chau") or ((("nguyen thi minh khai") OR ("nguyen thi bich khai"))))*.