Perhaps you should try some spelling variations:
"nguyen can dinh chi" » "nguyen van dinh chi", "nguyen xuan dinh chi", "nguyen cong dinh chi", "nguyen cac dinh chi", "nguyen can dinh thi", "nguyen can dinh tri", "nguyen can dinh moi"
"nguyen thu minh chau" » "nguyen thi minh chau", "nguyen nhu minh chau", "nguyen tu minh chau", "nguyen thu tinh chat", "nguyen vu minh chau"
"nguyen chi minh chau" » "nguyen thi minh chau", "nguyen nhu minh chau", "nguyen hai minh chau", "nguyen chi tinh chat"

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