You can also find in st03n.
1. Open st03n --> expert mode
2. Double click on the period(today,week/month) to find the tcodes used by the user in that period.
3. Now expert dialog mode will be displayed in the left corner. Please select transaction profile
4. Double click on the same, you will find the all the results in right side dialog. click on find and enter user name.
5. Now again double click on the user. You can see all the transactions used by user.