There is disclosed a computer-implemented method for generating a hierarchical data structure. The computer-implemented method can be executable at a server. The computer implemented method comprises: identifying a plurality of data elements to be searched, the plurality of data elements having a set of descriptors, each descriptor within the set of descriptors being associated with a data type being different from data types of other descriptors within the set of descriptors; defining the hierarchical data structure, having a first level and a second level.