How do I implement search within my PowerApp? I have a drop-down that filters the location, I want the search to look for the first name or last name, and status.

The browse gallery formula is:
SortByColumns(
Filter(
[@'Leave Tracking'],
Campus = Dropdown1.Selected.Result,
StartsWith(
Title,
TextSearchBox1.Text
)
),
"Title",
If(
SortDescending1,
Descending,
Ascending
)
)
How do I add search function into there?