I tried as told by Sane.Amit. But still i am getting the same result.
Because it is already trimmed in the display template.
So i updated the display template Item_CommonItem_Body.
I replaced the below portion
var titleHtml = String.format('<a clicktype="{0}" id="{1}" href="{2}" class="ms-srch-item-link" title="{3}" onfocus="{4}" {5}>{6}</a>',
$htmlEncode(clickType), $htmlEncode(id + Srch.U.Ids.titleLink), $urlHtmlEncode(url), $htmlEncode(ctx.CurrentItem.Title),
showHoverPanelCallback, appAttribs, Srch.U.trimTitle(title, maxTitleLengthInChars, termsToUse));
with the below code
var titleHtml = String.format('<a clicktype="{0}" id="{1}" href="{2}" class="ms-srch-item-link" title="{3}" onfocus="{4}" {5}>{3}</a>',
$htmlEncode(clickType), $htmlEncode(id + Srch.U.Ids.titleLink), $urlHtmlEncode(url), $htmlEncode(ctx.CurrentItem.Title),
showHoverPanelCallback, appAttribs, Srch.U.trimTitle(title, maxTitleLengthInChars, termsToUse));
This brought the full title but in single line.
Now i changed the CSS with the below change:
.ms-srch-ellipsis
{
/*white-space:nowrap;*/
overflow:hidden;
text-overflow:ellipsis;
-ms-text-overflow:ellipsis;
}
Now it worked nicely as expected.