Fix issues in Magento CE 2.1.10

Hi, I have a Magento 2.1.10 webshop where I'ld like to have some minor things fixed. Please check the list below: 1: Improve search: 1A: Magento 2 is searching for each word individually. I only want to find the result where both search terms are in. So if I search on Toyota Auris I now get all results for Toyota and all results for Auris, but I only want results where "Toyota" and "Auris" are in. 1B: Make it possible to search on SKU (SKU should be hidden for customer, but should be able to search on) 1C: Improve paginating on search result page: Don't make use of infinte scroll, but make use of paginating. (Infinite scroll is only used on Category-pages) 1D: I'ld like to have a category filter in the search result, that isn't there right now 2: Error when duplicating a product in backend: I'ld like to have this issue fixed in my webshop: [login to view URL] 3: It shouldn't be possible to create an account (so /customer/account/create/ shouldn't be accessible), but if you disable Magento_Customer it will throws JavaScript errors in the checkout, so I'ld like to have a different solution to prevent people from creating an account If you have any questions, don't hesitate to ask! I prefer to be on a common ground before you start the work! Also let me know how much experience you have with bugfixing in Magento 2. If everything is delivered correctly there will be more work coming to you in the next couple of months! Kind regards, Gerben