I have three columns

A B C
1 17 5
2 33 6
2 17 5
2 32 6
2 17 3
2 33 5
1 17 5

I would like to be able to write a formula that will look at the data in
column A and if the number is two, then go to column b and if the number is
17 then go to column C and find all the number 5 rows?
Data Sort and Advanced sort does not do what I need to do. Can a formula be
written for this?