Perhaps you should try some spelling variations:
astronomy studies » astronomy study, economy studies, astronomy status
moore nautical » moore national, some nautical
board nautical » board practical, board national, board neutral
mile nautical » ii nautical, some nautical
i nautical » ii nautical, _ nautical, a 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 ((((moore nautical) OR (board nautical))) OR (((mile nautical) OR (i nautical)))) astronomy studies.
• The words AND, OR and NOT may confuse the search; try adding quotes: "the patrick ((((moore nautical) or (board nautical))) or (((mile nautical) OR (i nautical)))) astronomy studies".
• Adding a wildcard symbol may retrieve word variants: the patrick ((((moore nautical) or (board nautical))) or (((mile nautical) OR (i nautical)))) astronomy studies*.