1. A system configured to associate base content with relevant content, the system comprising: A processor; a parsing module configured to parse the base content to form parsed base content; a unit-dictionary module coupled with the parsing module and including a plurality of query units; a query processing engine coupled with the unit-dictionary module and configured to receive and remove query units from the plurality of query units in the unit-dictionary module; a unit-extraction module coupled with the unit-dictionary module and configured to selectively extract at least one query unit of the plurality of query units from the parsed base content, wherein the parsed base content includes the extracted at least one query unit; a unit-ranking module coupled with the unit-extraction module and configured to rank the extracted query units based on a relevance score and a revenue-generation amount for the extracted query units to identify relevant content, wherein the relevance score is based at least partially on a location of the extracted query unit within the base content; and a unit-matching module coupled with the unit-ranking module and configured to generate at least one association between the base content and the relevant content based on a similarity between the extracted query units and a query unit associated with the relevant content, wherein the relevant content includes at least one advertisement.