Perhaps you should try some spelling variations:
"nguyen nhu dinh thi" » "nguyen thi dinh thi", "nguyen huu dinh thi", "nguyen huy dinh thi", "nguyen chu dinh thi", "nguyen nhu binh thi", "nguyen nhu minh thi", "nguyen nhu dinh tri"
"nguyen chi minh chau" » "nguyen thi minh chau", "nguyen hai minh chau", "nguyen thu minh chau", "nguyen chi tinh chat"
"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"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("nguyen nhu dinh thi") or ((("nguyen chi minh chau") OR ("nguyen can minh chau"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen nhu dinh thi") OR ((("nguyen chi minh chau") OR ("nguyen can minh chau"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen nhu dinh thi\") or (((\"nguyen chi minh chau\") OR (\"nguyen can minh chau\"))))*".
• Removing quotes may allow a broader search: (( nguyen nhu dinh thi ) or ((( nguyen chi minh chau ) OR ( nguyen can minh chau ))))*.