WordPress search with more input fields?

Sorry, it’s unclear to me what your goal is, if you could clarify your question more and additional information like what kind of options you’re trying to use (are they custom fields, are they categories, tags, or other taxonomies, or another characteristic like post author?)

First, the select inputs should not have blank name values. (visit this a11y guide page for an example of building a search form with select lists as an example although the example is not specific to WordPress.) Having blank name values usually results in errors in a search form.

(Visit for an example search query How do I properly redirect outbound links with special characters)