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How to use free text search:
The following expressions and symbols can be used in free text searches:
Example complex search: "water sanitation" -(irrigation|drainage)
Document must contain the words 'water' and 'sanitation' adjacently in any field in a document, but not contain either 'irrigation' or 'drainage'.
Note: It is not possible to use single words in combination with the negative expressions and symbols, such as ‘|’, ‘OR’, ‘NOT’, ‘-’, ‘!’. So a query that just contains ‘-water’ would not be acceptable. It would be acceptable to put ‘sanitation -water’