Perhaps you should try some spelling variations:
"nguyen tuan minh thi" » "nguyen xuan minh thi", "nguyen thanh minh thi", "nguyen quang minh thi", "nguyen tran minh thi", "nguyen tuan dinh thi", "nguyen tuan minh thu", "nguyen tuan minh tri"
"nguyen huu minh thi" » "nguyen duc minh thi", "nguyen huu dinh thi", "nguyen huu minh thu", "nguyen huu minh tri", "nguyen huu manh thi", "nguyen huu binh thi"
"nguyen hai minh chau" » "nguyen thi minh chau", "nguyen van minh chau", "nguyen can minh chau", "nguyen hai tinh chat", "nguyen khai minh chau", "nguyen thai minh chau", "nguyen hai linh 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 tuan minh thi") or ("nguyen huu minh thi"))) or ("nguyen hai minh chau"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nguyen tuan minh thi") OR ("nguyen huu minh thi"))) OR ("nguyen hai minh chau"))*.
• Removing quotes may allow a broader search: (((( nguyen tuan minh thi ) or ( nguyen huu minh thi ))) or ( nguyen hai minh chau ))*.