The problem is that you are searching on the keywords_name column, this column does not contain any records that have the string "iphone 5"
to troubleshoot this, i edited the mouse over text so it would show both the product name and keyword column:
title="<?php echo $row_rsproducts['product_name']; ?>||<?php echo $row_rsproducts['keywords_name']; ?>"
for all of the records where product name includes "iphone 5" the keyword only contains "iphone"
you're trying to search for a string that does not exist in the keywords_name column