Sometimes you want to change the way wordpress search works, for example you want it to force to search pages only or just posts. The code for that would be something like this
//Search only pages
function is_type_page() {
global $post;
if ($post->post_type == 'page') {
return true;
} else {
return false;
}}
//Search only posts
function is_type_post() {
global $post;
if ($post->post_type == 'post') {
return true;
} else {
return false;
}}
Then in the search page, i.e search.php just use this code
while ( have_posts() ) : the_post(); if (is_type_post()) continue;
Above code will restrict search to the pages only. Similarly you can restrict pages to be excluded from search with the following code
while ( have_posts() ) : the_post(); if (is_type_page()) continue;
Hope that helps 
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. Google rules the SEO tech world and everybosy wants to be in google SERPS (Search engine result pages). Working around the rules that keep Google and other search engines relevant is arcane at best and at worst will result in your sites being demoted in relevance or delisted entirely. Yep that happens. I have learnt it from my best and worst SEO experiences. There are many theorists and companies that indulge in this sort of speculation and some are more successful than others at nudging search results in the ways they desire them to.