Multiple columns searching not working?

I have a single input outside of the table. I want to search multiple columns but it's not working. It only works for the first index. Is there any solution?

Note: All these columns ar searchable but only work for the first index, If I set first index 1 it will search the index 1 one column but I need to search specific columns through the index.

this.api().columns([0,1]).search(keyword).draw();