Perhaps you should try some spelling variations:
"nguyen xuan trinh thue" » "nguyen van trinh thue", "nguyen qua trinh thue", "nguyen xuan dinh thue", "nguyen xuan kinh thue", "nguyen xuan trinh thuc", "nguyen xuan tinh thue", "nguyen xuan trinh thuy"
"nguyen thi bich khue" » "nguyen thi bich thuy", "nguyen thi bach hue", "nguyen thi kich khuc"
"nguyen thi minh khue" » "nguyen chi minh khue", "nguyen thi hanh khue"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen xuan trinh thue") OR ((("nguyen thi minh khue") OR ("nguyen thi bich khue"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen xuan trinh thue\") or (((\"nguyen thi minh khue\") OR (\"nguyen thi bich khue\"))))~".
• Removing quotes may allow a broader search: (( nguyen xuan trinh thue ) or ((( nguyen thi minh khue ) OR ( nguyen thi bich khue ))))~.
• Adding a wildcard symbol may retrieve word variants: (("nguyen xuan trinh thue") or ((("nguyen thi minh khue") OR ("nguyen thi bich khue"))))*.