I have been thinking if there is any extensions/enhancements/upgrades for search view in order to make the search more user friendly; want to check the following criterias if anyone knows of:

1) In my native language (the one I use for Odoo), we have accents for vowels (á,é,í,ó,ú), is there a way for the search engine to identify vowels with accents by searching them with no accent? (á = a, é = e, etc.) 

For example, search for union matches (union or unión).

2) Search for words in sentences separately and not full string:

Example: Serch "Apple breakfast" find something like "Make your breakfast with apples", "apple pie breakfast", etc.

3) Way to filter "different from" directly from search bar and not using the custom filter.

Example: != apple: show all records for quick category selected which doesn't match apple.

If there are more usecases that could be achieved, will be much more appreciated.

Hope it is clear.

Thanks beforehand for your answers