Perhaps you should try some spelling variations:
"the patrick moocs practical astronomy surveys" » "the patrick moocs optical astronomy surveys", "the patrick moocs practical astronomy survey", "the patrick moocs practical astronomy surveying", "the patrick moocs practical astronomy survives", "the patrick books practical astronomy surveys", "the patrick mics practical astronomy surveys", "the patrick colts practical astronomy surveys", "the patrick mons practical astronomy surveys", "the patrick moyes practical astronomy surveys", "the patrick moore's practical astronomy surveys"
"the patrick moocs practical astronomy seven" » "the patrick moocs optical astronomy seven", "the patrick books practical astronomy seven", "the patrick mics practical astronomy seven", "the patrick colts practical astronomy seven", "the patrick moocs practical astronomy some", "the patrick moocs practical astronomy science", "the patrick moocs practical astronomy between", "the patrick mons practical astronomy seven", "the patrick moyes practical astronomy seven", "the patrick moore's practical astronomy seven"
"the patrick moocs positional astronomy seven" » "the patrick holds positional astronomy seven", "the patrick blocks positionals astronomy seven", "the patrick images positional astronomy seven", "the patrick moocs positional astronomy some", "the patrick moocs positional astronomy science", "the patrick moocs positional astronomy between", "the patrick mons positional astronomy seven", "the patrick moyes positional astronomy seven", "the patrick moore's positional astronomy seven"
"the patrick moore positional astronomy seven" » "the patrick aware positional astronomy seven", "the patrick pure positional astronomy seven", "the patrick whole positional astronomy seven", "the patrick moore positional astronomy some", "the patrick moore positional astronomy science", "the patrick moore positional astronomy between"
"the patrick moocs nautical astronomy sergey" » "the patrick moocs nautical astronomy survey", "the patrick moocs nautical astronomy large", "the patrick moocs nautical astronomy society", "the patrick hoc nautical astronomy sergey", "the patrick logs nautical astronomy sergey", "the patrick nos nautical astronomy sergey", "the patrick mons nautical astronomy sergey", "the patrick moyes nautical astronomy sergey", "the patrick moore's nautical astronomy sergey"

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