Hi zaphi,
You can have more then five conditions, here is the way,
1. Add five "and" conditions.
2. In the 4th and 5th conditons, select expression in the first dropdown.
3. At the end of the fourth condition's expression type "and"
4. Copy fifth condition's expression and paste it at the end of the fourth condition.
5. Now you can add sixth condition in the fifth conditions place.
Similarly you can add 7th condition also.