Search Accuracy - Search Results in Dle

1. using Title i search a keyword its working fine.


2. same thing at the end i just added (ravikota) at the end of the key word its not working...


example
keyword : Autodesk Maya 2014 SP3 --- working
keyword : Autodesk Maya 2014 SP3 mediafire --- not working.

keyword : Autodesk Maya 2014 SP3 --- working
keyword : Autodesk Maya 2014 SP3 123 --- not working.

can any one please fix this issue...

thnx..