Perhaps you should try some spelling variations:
central dimensions » cultural dimensions, ceintric dimensions, central extensions
information about » information age, information a
about central » about cultural
array string » array strong, arrays strings, array sharing
array using » arrays using
arrays ang » arrays a

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• If you are trying to use Boolean operators, they must be ALL CAPS: information about central dimensions ((arrays ang) OR (((array using) OR (array string)))).
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