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The evolution of the Internet and the number of users requires the development of systems increasingly sophisticated and powerful enough to monitor and track this growth. This development calls for the establishment of specialized Information Retrieval Systems (IRS), fast and efficient to meet a very definite need. In response, these systems should be able to carry out several steps, such as enrichment or reformulation of the user query entered in the search box along with other tasks. Enrichment can be enhanced by adding terms to the initial query in order to find the right document. This paper falls within the framework of query enrichment. The main purpose of the study is the enrichment of the user query by using the ODP resource and a set of predefined concepts. The proposed approach will be included in the IRS of a meta-search engine dedicated to the field of higher education. The ODP resource is organized in the form of ontology while the concepts defined are classified into two categories with each having subcategories. The ODP can detect the searched domain by the user. Application classes (AC), contained in the domain, specify the application domain. Utilization classes (UC) specify the exact use of AC. Each utilization class contains a set of patterns used in the first step for detecting the need of the user and thereafter for enrichment.