Textfield / combobox autocomplete.

Hello , i just want to ask if is possible to have an textfield / combobox with multiple stores / urls for autocomplete.

Let me explain why : i want textfield / combbox with autcomplete because when i search, i need to make 2 requests 1 is with a large group of products and 1 is with a small group of products and until the bigger one is ready i want to show the small group of products. In the end i will show both.

Thanks.

Textfield / combobox autocomplete.