How to find an entry from filtering with two associated tables
Is this what you're looking for?

select
    a.title as 'attr_title',
    ae.title as 'attr_entry_title',
    a.model as 'attr_model',
    p.id as 'attr_model_id'

from
    products p
inner join
    attributes a on a.model_id = p.id
inner join
    attribute_entries ae on ae.FK_attribute_id = a.id
where
    ae.title in('ford','windstar')


You might be able to modify the where clause like this to exclude unselected terms:

ae.title not in (select title from attribute_entries where title not in ('ford', 'windstar')