Perhaps you should try some spelling variations:
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore optical » moire optical, moon optical, fibre optical
core optical » large optical, wave optical
more optical » moire optical, mode optical, more optimal

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 optical) OR (core optical))) OR (more optical)) astronomy sergey.
• Adding a wildcard symbol may retrieve word variants: the patrick ((((moore optical) or (core optical))) or (more optical)) astronomy sergey*.