Why my wordpress website does not display urdu text fully while searching for any thing on its search bars?

you should use @font-face for including webfonts. src is not valid outside @font-face (https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/src) – nevertheless, there are a few very tolerant browsers.

Remove your styles from style.css line 45–52 and put the following on the top of the file:

@font-face {
    font-family: 'nafeesnastaleeq';
    src: url('fonts/nafees/nafeesnastaleeq.eot');
    src: url('fonts/nafees/nafeesnastaleeq.eot?#iefix') format('embedded-opentype'),
        url('fonts/nafees/nafeesnastaleeq.woff') format('woff'),
        url('fonts/nafees/nafeesnastaleeq.ttf') format('truetype'),
        url('fonts/nafees/nafeesnastaleeq.svg#nafeesnastaleeq') format('svg');
    font-weight: normal;
    font-style: normal;
}

now you can call your font in the body via

body {
    font-family: 'nafeesnastaleeq', sans-serif;
}