Say why does the search:
title:(Roadside Picnic) AND (authors:(Arkady) OR authors:(Boris Strugatsky))
give nothing while
title:(Roadside Picnic) AND authors:(Arkady) OR authors:(Boris Strugatsky)
gives the book, if the first search is more correct (i'm not doubting - i've seen it's more correct in other cases).
Say why does the search:
title:(Roadside Picnic) AND (authors:(Arkady) OR authors:(Boris Strugatsky))
give nothing while
title:(Roadside Picnic) AND authors:(Arkady) OR authors:(Boris Strugatsky)
gives the book, if the first search is more correct (i'm not doubting - i've seen it's more correct in other cases).