Perhaps you should try some spelling variations:
"nguyen chi minh chau" » "nguyen can minh chau", "nguyen nhu minh chau", "nguyen hai minh chau", "nguyen chi tinh chat"
"nguyen thi minh khai" » "nguyen thi minh khue", "nguyen thi minh chi", "nguyen thi minh thao", "nguyen thi hanh khai", "nguyen thi bich khai"
"nguyen thi minh pham" » "nguyen thi dinh phap", "nguyen thi minh thao", "nguyen thi hanh pham", "nguyen thi bich pham"

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 chau") or ((("nguyen thi minh khai") OR ("nguyen thi minh pham"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chi minh chau") OR ((("nguyen thi minh khai") OR ("nguyen thi minh pham")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen chi minh chau\") or (((\"nguyen thi minh khai\") OR (\"nguyen thi minh pham\"))))".
• Removing quotes may allow a broader search: (( nguyen chi minh chau ) or ((( nguyen thi minh khai ) OR ( nguyen thi minh pham )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh chau") or ((("nguyen thi minh khai") OR ("nguyen thi minh pham"))))*.