Google serach undefined..

i get my site listed top always with a specific search name "yuvasoft"
but when i split the words or try some other it goes hidden...
why this happens

 

because search engines are keyword sensitive.. although it is the same keyword, once you've inserted space between the characters or split them into two words, it'll be considered as different terms

 

If you have anchor text on backlinks with the keyword spaced how you want you'll be able to recieve results.

 

Yes, always use one keyphrase, don't split.