'icici bank'
Find rows that contain at least one of the two words.
'+icici +bank'
Find rows that contain both words.
'+icici Bank'
Find rows that contain the word icici Bank, but rank rows higher if they also contain bank.
'+icici -bank'
Find rows that contain the word icici but not bank.
'+icici ~bank'
Find rows that contain the word icici, but if the row also contains the word bank, rate it lower than if row does not. This is softer than a search for '+icici -bank', for which the presence of bank causes the row not to be returned at all.

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