1. In a health care enterprise, a computerized provider order entry system for receiving one or more search terms from a health care provider and finding an order for providing a medication or medical service related to the one or more search terms, comprising: a repository including a plurality of records identifying a corresponding plurality of medications or medical services available for order, a record of an individual medication or medical service available for order including a plurality of related text terms describing order related parameters, including terms identifying a treatment and at least one of: (a) a diagnosis code associated with the medication or medical service available for order, (b) a medical condition associated with the medication or medical service available for order, and (c) a medical problem associated with the medication or medical service available for order; a search processor for searching said plurality of records to find candidate medications or medical services available for order corresponding to the one or more health care provider entered search terms by: determining a relative frequency of occurrence of respective ones of the one or more search terms in the related text terms of corresponding records of candidate medications or medical services available for order; summing data representing the relative frequency of occurrence of the respective ones of the one or more search terms to provide data representing a summed relative frequency of the one or more search terms in corresponding records of candidate medications or medical services available for order; identifying and prioritizing candidate medications or medical services available for order in response to the summed relative frequency of occurrence of said health care provider entered search terms in corresponding records of said candidate medications or medical services available for order; and ranking said identified and prioritized candidate medications or medical services available for order in response to a relative frequency of ordering of said identified and prioritized candidate medications or medical services available for use by health care providers; wherein said search processor alters search result ranking based on voting mechanisms for said medications or medical services available for order, said voting achieved by at least one of (a) selection of an item for order in normal use and (b) manual adjustment of priority weighting of that item for order; and an output processor for providing search result data representing said ranked, identified and prioritized candidate medications or medical services.