how to write Elasticsearch(NEST for .net) query to produce result like power set?

I'm using Elasticsearch with default implementation for searching products of my eCommerce site. This default implementation is producing considerably relevant search results. However, I want my search results to be in a specific format exactly like a power set.

For example, if I search with milk powder, the results should have a priority like

1. milk powder ( e.g. full cream milk powder)
2. powder milk ( e.g. instant powder milk formula)
3. milk (e.g. liquid cow milk)
4. powder (e.g. insect powder)

My current implemented code is:

            results = _client.Search<ProductDefault>(s => s
                .Query(q => q
                    .Match(t => t
                        .Field(f => f.title_en.ToLower())
                        .Query(parm.k.ToLower())
                    )
                ).Size(1000)
            );

how to refactor the above query to produce search results exactly like a power set?