Perhaps you should try some spelling variations:
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"the patrick moon optical astronomy series" » "the patrick moon nautical astronomy series", "the patrick moon spherical astronomy series", "the patrick moon optical astronomy sergey", "the patrick moon optical gastronomy services", "the patrick moon optical astronomy survives", "the patrick moore optical astronomy series", "the patrick mein optical astronomy series", "the patrick mons optical astronomy series", "the patrick ion optical astronomy series", "the patrick non optical astronomy series", "the patrick photon optical astronomy series"
"the patrick moon positional astronomy series" » "the patrick moon positional astronomy sergey", "the patrick moon positional gastronomy services", "the patrick moon positional astronomy survives", "the patrick non positional astronomy series", "the patrick moon positioning astronomy series", "the patrick body positional astronomy series", "the patrick moore positional astronomy series", "the patrick mein positional astronomy series", "the patrick mons positional astronomy series"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("the patrick moocs practical astronomy series") OR ((("the patrick moon optical astronomy series") OR ("the patrick moon positional astronomy series")))).
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• Adding a wildcard symbol may retrieve word variants: (("the patrick moocs practical astronomy series") or ((("the patrick moon optical astronomy series") OR ("the patrick moon positional astronomy series"))))*.