what is your title of opened profile? The title is very important to catch their attention. In addtion, you should keep updating your resume very frequently. If you think your resume is perfect enough, delete few space, then add something to update it again so that your profile will be listed at the beginning of long profile list.
I suggest you go to library or HRDC several times per week to look for job hunting resources for hidden job market. If you spend most of time to send cold fax or cold e-mail, you will be more busy every day, and you will have more interview in the near future. Keep trying, never give up.