This is a forum almost purely run by volunteers. We do this in our spare time. There is no right on a quick answer and actually there is no right for an answer at all.
In your survey go to "responses" --> "responses & statistics" --> "Display responses". You will see a list of all responses (complete and not complete). On top of each column (response) you have a text box which you can use to filter the responses. There is also an option to filter for complete or non complete responses.
In your survey go to "responses" --> "responses & statistics" --> "Display responses". You will see a list of all responses (complete and not complete). On top of each column (response) you have a text box which you can use to filter the responses. There is also an option to filter for complete or non complete responses.