Perhaps you should try some spelling variations:
"nguyen chi minh chau" » "nguyen thi minh chau", "nguyen can minh chau", "nguyen nhu minh chau", "nguyen chi tinh chat"
"nguyen huy minh pham" » "nguyen huu minh pham", "nguyen duy minh pham", "nguyen duc minh pham", "nguyen huy dinh phap", "nguyen huy minh khai", "nguyen huy minh thao", "nguyen huy sinh pham"
"nguyen van binh chi" » "nguyen van minh chi", "nguyen van dinh chi", "nguyen van linh chi"

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 huy minh pham") or ("nguyen van binh chi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chi minh chau") OR ((("nguyen huy minh pham") OR ("nguyen van binh chi")))).
• Removing quotes may allow a broader search: (( nguyen chi minh chau ) or ((( nguyen huy minh pham ) or ( nguyen van binh chi )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen chi minh chau") or ((("nguyen huy minh pham") or ("nguyen van binh chi"))))*.