If your theme is not working, you’ll need to contact the developer here:
http://themeforest.net/item/innotech-premium-responsive-wordpress-theme/2279300
In the meantime, try deactivating your plugins to see if any may be causing that problem.
Why not add the content being searched for in the posts/pages (F-150, F150) ???
They can even be in a hidden div!
Category/Tag or custom Page Templates could do the trick easily!
HTML:
<div class="f150">F-150, f-150, F150, f150</div>
CSS:
.f150 {
display:none;
}
Proof:
http://seacoastwebservice.com/a-child-category-sub-menu/
http://seacoastwebservice.com/?s=f150&submit=Search