Examples:
to find all companies using java, use search string: java
to find all companies developing voip service using java systems in atlanta, try search strings:   java atlanta voip
to find all ops departments supporting unix systems that doing bash and perl scripting, try search strings:   ops bash perl unix
to find all companies building middleware products on using .net, try search strings:   middleware .net

Notes:
to get a feel for the data, search on a common term first (like java) to get a large enough sample of entries
to find adjacent strings, enclose in "", eg: "server side"
to force whitespace in search, enclose in "", eg: " c "
multiple search strings are ANDED
search depends on free-form terms used during entry. try different search terms