post content search

Can wordpress search engine only search the content which access user can see, not include the content inside <a href=”xxx” title=”xxx”.
If “xxx” matches the search word, the search result will include this post, even the truly content of this post that user can see has no this word (because users cannot see “xxx” which is inside <a href..).
In worst case, user searches the word which is just the part of site domain name, the search result will display all the posts which contain internal link, image,… because there are <a href=”domain name…” and <img src=”domain name…” in these posts. So the result is definitely not that user wants.
One way may resolve this problem, use relative address or relative link. but it is not wordpress provides. manually changing these is too tough.
Is there anyone who can answer this question?