To change or remove blog title from post title blogger that shows in the search results and on the tab in browser you need to find the following line in the head section of your blogspot template code
<title><data:blog.pageTitle/></title>
and replace it with the following
<b:if cond='data:blog.pageType == "item"'>
<title><data:blog.pageName/> </title>
<b:else/>
<title><data:blog.pageTitle/></title>
</b:if>
The above addition will ensure that your blogspot blog title is shown only on homepage and the post title will be shown in search results without blog title.