Help I'm stuck!

Sample Data

Sheet1
A B C
Stock# Sales Person Type
90012 Bill New
91048 Sam Used
90456 Bill Used
91234 Frank New
91114 Bill New
91486 Bill New

Sheet 2
A B C
Bill New (Drop down boxes to select
search criteria)

Results I'm wanting if "BILL" in b1 and "New" in C1:
90012 Bill New
91114 Bill New
91486 Bill New

Results I'm wanting if "BILL" in b1 and "Used" in C1:
90456 Bill Used

Results I'm wanting if "BILL" in b1 and "" in C1:
90012 Bill New
90456 Bill Used
91114 Bill New
91486 Bill New

Stock numbers are unique if that helps