Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
national astronomy » national autonomy, nautical astronomy, regional astronomy
astronomy survives » astronomy surveys, astronomy studies
astronomy survey » astronomy surveys, astronomy sergey, autonomy survey
moore practical » more practical, moocs practical, mouse practical
moore national » moors national, more national, before national

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 practical astronomy survey ) OR ( the patrick moore national astronomy survives )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore practical astronomy survey ) or ( the patrick moore national astronomy survives ))*.