Hi,
Well, there is only a possibility to have a single search field to enter all the keywords in.
There is however a custom field filters as a text input field. So if some of the keywords are stored in a custom field, then it could be used as sort of an exact match. However it must be noted, that exact match in that case means, that the field content must exactly match the keyword entered – so if there are multiple words in the field, then it will only match if all the text is exactly the same as entered in the field.