Perhaps you should try some spelling variations:
astronomy survives » astronomy survey, astronomy studies
astronomy surveys » astronomy survey, astronomy surveying, astronomy sergey
moocs practical » mics practical, abcs practical, ics practical
moocs nautical » hoc nautical, logs nautical, nos nautical

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: the patrick ((moocs nautical) OR (moocs practical)) ((astronomy surveys) OR (astronomy survives)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "the patrick ((moocs nautical) or (moocs practical)) ((astronomy surveys) OR (astronomy survives))".
• Adding a wildcard symbol may retrieve word variants: the patrick ((moocs nautical) or (moocs practical)) ((astronomy surveys) OR (astronomy survives))*.