Happiness search engine additionally needs a smart-phone application to survey happiness (Experience sampling method) and pair it with user's profile and history. Links that are likely to increase happiness are moved up in search results.
Difference is: 1. Search engine as Google gives you well-written sites appropriately linked though web (https://support.google.com/webmasters/answer/7451184?hl=en). Happiness search engine will provide results that are likely to increase average (societal, long-term) happiness score. 2. Empty query in Google gives no results.
The same is: 1.Keywords. 2.Additional data about users and their environment should improve the search.
The question is edited.
Thank you
M.