Please help some serious 500 crawler error.

Hi everyone, I have been running entertainment site smoothly on wordpress but this serious crawler error appeared in my webmaster tool which is eating my traffic.
Google Webmaster tool reported more then 100 , 500 error.. whuen i saw them I started to redirect all bad links to homepage.. I thought now error has gone but again today more such 500 error appeared can any one help me out I am loosing my traffic due to this weird links crawled by Google.
Searched everywhere tried to fix it but this crawler error is appearing everyday and is increasing day by day…

search/nepali+movie+khushi/feed/2012/03/2012/05/2012/04/six-health-benefit-of-sex-you-wont-believe/

search/www+nepali+full+movie/feed/rss2/www.nepalimutu.com/2012/05/akasaima-chil-udyo-x-mantra-band-lyrics-guitar-chord-music-video/

search/2012/04/2012/05/nepali-pop-s-ongs-timi-mero-hau-saathi-the-uglyz-lyrics-guitar-chord-music-video/

Please help me to fix this