Search list - Query term

I tried to execute this code to get the Search list:

YouTube.Search.List searchList =youtubeService.search().list("snippet");searchList.setMaxResults(50);searchList.setQ("channelName");searchList.setType(Collections.singletonList("channel"));searchList.setPageToken("nextPageToken");

I tried to set 2 channel names but I get duplicated rows, how i can remove this duplicated in the query?

set the 2 channels' names for the same page, and get duplicated rows.

expected to get correct rows.