Seems your page does not have next button. << is the last page instead on next.
What you can do is
1. Get the total number of records (it is displayed on top)
2. Divide it by 36 as there are 36 items shown on a page and calculate number of pages
Or
Click << once and get the last page value from url.. It is like ..?pageno=15&sortby=4
3. Then extract table data from each page in a loop while page no is <=15 starting from 1.
By creating the dynamic URL as
https://www.digikala.com/search/category-sausages/?pageno=variable&sortby=4Let the page load
Extract table data in dt1
Merge it in another data table dt2
Finally you will have all records in dt2
Hope this helps