1. A computer-implemented method for performing a search in a database, the method comprising: receiving a selection of relationship categories, each relationship category defining an association between at least two information entities that belong to one or more business information categories; receiving a request that includes at least two search terms for searching the database, the search terms identifying respective information entities; in response to the request, performing the search in the database for information relating to the information entities identified by the search terms, the search based on semantics of the search terms; and presenting a first search result responsive to the request, the first search result including a separate list of information for each of the search terms, each separate list including at least one action advice defined specifically for a corresponding business information category to which the information entity identified by the search term belongs, wherein the action advice is to be activated by input to display additional information associated with the corresponding business information category; presenting a second search result responsive to the request, the second search result including a document in each of the relationship categories selected, each document describing the association between the information entities identified by the search terms, the second search result further including at least one document action advice specifically defined for each relationship category, wherein the document action advice is to be activated by input to process the document generated in the second search result, wherein the relationship categories include one or more of the following: purchase order, invoice, receipt, sales order, delivery and goods returns, and the business information categories include one or more of the following: chart of accounts, posting periods, payments, warehouses, bill of materials, banks, business partners, and employees.