Database search options

I have a table I am searching on. Here is the code I am using. Can you tell me how and where if i want to add a second table element to search on using the same search box? Currently my search box is searching on the title of a document. My documents have numbers and I would like to search on that as well using the same search box.

import wixData from ‘wix-data’;

export function input1_keyPress_1() {
wixData.query(‘Letters’)
.contains(‘title’, $w(‘#input1’).value)
.find()
.then(res => {
$w(‘#table1’).rows = res.items;

}); 

}