There could be some reasons as follows. 1. Your resume has problem. It does not show much experience in US and thus clients will simply pass this kind of resumes. 2. The hunter got so many resumes and those resumes will go to the hunter's manager. The manager will only select several resumes to submit to clients and your resume is not picked up. 3. The position is closed for some reason. 4. The position is filled in for some very good candidate before you.