Perhaps you should try some spelling variations:
"nguyen can tinh thue" » "nguyen xuan tinh thue", "nguyen cong tinh thue", "nguyen manh tinh thue", "nguyen can tinh thua", "nguyen can trinh thuc", "nguyen can trinh thuy", "nguyen canh tinh thue", "nguyen ban tinh thue", "nguyen cac tinh thue"
"nguyen van tinh thue" » "nguyen van tinh thua", "nguyen van trinh thuc", "nguyen van trinh thuy", "nguyen van thinh thue", "nguyen van minh thue", "nguyen ban tinh thue"
"nguyen thi minh khue" » "nguyen chi minh khue", "nguyen thi hanh khue", "nguyen thi bich khue", "nguyen thi minh hue", "nguyen thi minh khu", "nguyen thi minh khoe"

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