If your question is why are the queries
'(field:software field:engineer)'
and
'(+field:software +field:engineer)'
returning the same results, it could be because none of your documents have
*only* "software" *or* "engineer", i.e. they all have both words or neither.
You could test this theory with a db containing only the 4 documents below
(one per line):
other unrelated words
the software
the engineer
the software engineer
Good luck!
--MDC
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