Dear Hanan,
I'm following up on the thread.
Generally, you can connect the gallery control to the Excel Online table such as Table1 and create a text box TextInput1 as a search box and type the following formula to search the Excel items based on a column such as Column1.
Search(Table1,TextInput1,"Column1")
I guess that you want to add a second search box TextInput2 and search the Excel items based on another column such as Column2 in the same gallery.
If yes, you can use the following formula to see the result.
Search(Search(Table1,TextInput1.Text,"Column1"),TextInput2.Text,"Column2")
Welcome to share any updates when you have time if you need further help on this issue.
Sincerely,
Cliff | Microsoft Community Moderator