1. A method comprising: identifying an initial query; identifying one or more additional queries related to the initial query; for each query including for the initial query and the one or more additional queries, identifying one or more candidate content items and grouping the one or more candidate content items in a block for a respective query for presentation to a user; evaluating each block using comparison criteria including determining a number of content items to include in a respective block wherein the comparison criteria compares either a number of content items in each block to a number of content items in another block or a number of content items in a respective block that are from a same entity; based on the comparison criteria, determining one or more blocks that have too few or too many content items associated therewith based on the respective determined numbers; when a block has too few content items, requesting more content items to be associated with a respective query including broadening the respective query to enable identification of more content items to be associated with the respective query; else, when a block has too many content items, requesting fewer content items to be associated with a respective query including narrowing the respective query to filter out content items associated with the respective query; identifying refined candidate content items in response to the request for queries that had too few or too many content items; and providing a plurality of blocks for presentation responsive to the initial query including original candidate content items or refined candidate content items with respective queries in a given block wherein providing includes providing a first block including the initial query and original or refined candidate content items associated with the initial query and providing a second different block including an additional query of the one or more additional queries and original or refined candidate content items associated with the additional query, and wherein the original or refined candidate content items in each block are different.