Search with conditional OR

Thank you for try to help.
I already tried to search in this way, but this doesn't give me the reply of that i need.
When I do the search in this way, it shows only post with "all" words and not with "any" words.
Something like if this "+" is working like "and" instead of "or" and I really need that "OR".

I'm gonna explain you why. It's because will be used in a support system, when a customer start to type his support ticket, the system will get some words and will try find posts for customer.
 
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