In one exemplary aspect, a method includes the step of obtaining a content of a content block. The content is represented as a content vector. A query is received. The query is represented as a query vector. A hierarchical sliding similarity and dissimilarity is determined for matching the content vector and the query vector, this step can include the steps of: determining a similarity measure and a dissimilarity measure for each content vector element with respect to the query vector; identifying a strong match over a sliding window of sub-terms of each content vector element; computing a sub-similarity score and a sub-dissimilarity score for each level of the convent vector element; determining a final similarity score as a combination of the strong match of some sub-vectors at different levels; and determining a final dissimilarity score as a combination of the strong match of some sub-vectors at different levels.