OR, AND search
By default plugin use OR search logic. This means that when you search, for example, for Red t-shirt you will see in search results all products that has at least one of this words in its content.
But this behavior can be changed with help of Search logic option from plugin settings page.
Search logic option
By switching to AND search logic in the example above you will see in search results only products that contains both search words.
Partial, Exact match
Partial match means that inside search results will be visible products that has words that match only part of search word. For example, with search query cap there will be displayed products with word capacity.
But this behavior can be changes. When Exact search option enables inside search results will be visible only products that has exactly the same search word.
Exact search option