why search working stop in angular js?

I am trying to search element in table .But some time it work some time not why ?I will explain my problem I have one table in which i use infinite scroll .There is search input field in top .Using this I am able to search item in table .but I don't know why it is not working

<label class="item item-input">
    <img src="https://dl.dropboxusercontent.com/s/n2s5u9eifp3y2rz/search_icon.png?dl=0">
    <input type="text" placeholder="Search" ng-model="query">
  </label> 

plunker http://plnkr.co/edit/kRG2OEz0DyQlISaa2iAy?p=preview

when i type "ubs" it show "Ubs" rows .but when I type "ING" or "ing" it is not showing any data why ?

secondly Actually I am implementing infinite scroll so only 100 element display .can we search element from 2000 (which I am getting from service )and display data the search result ?