Perhaps you should try some spelling variations:
"nguyen cong minh chau" » "nguyen trong minh chau", "nguyen quang minh chau", "nguyen cong tinh chat", "nguyen cong vinh chau", "nguyen cong tinh chau", "nguyen song minh chau"
"nguyen chu dinh thi" » "nguyen nhu dinh thi", "nguyen thu dinh thi", "nguyen chi dinh thi", "nguyen vu dinh thi", "nguyen chu manh thi", "nguyen co dinh thi", "nguyen chu dinh tri"
"nguyen can minh chau" » "nguyen van minh chau", "nguyen xuan minh chau", "nguyen manh 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 chu dinh thi") or ((("nguyen can minh chau") or ("nguyen cong minh chau"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen chu dinh thi") OR ((("nguyen can minh chau") OR ("nguyen cong minh chau"))))*.
• Removing quotes may allow a broader search: (( nguyen chu dinh thi ) or ((( nguyen can minh chau ) or ( nguyen cong minh chau ))))*.