There is no AND/OR support yet. It's planned for a later release. However, as you're wanting this to apply to profile view only you can do the following condition on FILED4.
Display: Field conditional self
Field: Custom > Value
Value:
Code:
[cb:if FIELD1!=""]A[/cb:if][cb:if FIELD2!=""]B[/cb:if][cb:if FIELD3!=""]C[/cb:if]
Translate Value: No
Operator: Equal To
Value: ABC
Translate Value: No
Mode: Show
Registration: No
Profile Edit: No
Profile View: Yes
Userlists Search: No
Userlists View: Yes
Replace FIELD1, FIELD2, and FIELD3 with the actual name of the fields in the above value.