• "council" expenses - search for exact phrases by putting quote marks around them
• primary school -care - exclude words or quoted phrases by using a minus sign or NOT
• primary OR secondary school - use 'OR' to allow alternatives (the default is to 'AND' all of the terms)
• publisher:department-of-health res_format:CSV - search only in a particular field.

Detailed search format information can be found in the Lucene Documentation