how to create playlist of related videos after search video

Hi, this is my website which is in progress...!
http://jugnoo.tv
on first page em using XML playlist which is not retrieve from the database.

for searching videos em using PHP and MySQL database which contain following fields..!

id
link (it is use for the when click on any thumbnail then go its page)
image (link of the image)
text (title of the videos)
kw (keywords for searching videos)
des (description of searching videos)

now i want show related videos when search any video.
for example : if user search any video of training and click on it then also shows the video of related to the training..! like youtube, i hope u got my point..!

now tell me what i should do for show the related videos when search any video.