17. A system for searching for content items, the system comprising: memory; and hardware processing circuitry configured to: provide, on a local device, a local collection of content items and associated metacontent, the metacontent associated with each content item describing information content of the corresponding content item; access a remote catalog of metacontent items and keywords associated with the metacontent items stored on a remote server system; receive, on the local device, a search input from a user for finding a desired content item during a range of time of a sequence of ranges of times, wherein the sequence of ranges of times repeats cyclically after all ranges of times in the sequence of ranges of times have lapsed; receive a plurality of magnitudes of user interaction, wherein each respective magnitude of the plurality of magnitudes corresponds to an amount of user interaction of the user with a respective dataspace of a plurality of dataspaces of the remote catalog during the range of time; identify, based on the plurality of magnitudes, a dataspace of the plurality of dataspaces that corresponds to the respective magnitude having a greatest magnitude of user interaction of the plurality of magnitudes of user interaction; identify a metacontent item included in a subset of metacontent items of the remote catalog corresponding to the dataspace matching at least a part of the search input; retrieve, from the remote catalog, a keyword that is associated with the identified metacontent item, wherein the keyword has a different word stem than the search input has; form, at the local device, a search query comprising the keyword and the search input; compare, at the local device, the search query to the metacontent associated with the local collection to determine a subset of content items of the local collection that are each associated with metacontent that at least partially matches both the keyword and the search input of the search query; and generate for display, at the local device, an indication of the subset of content items based on a ranking criterion, wherein the ranking criterion includes learned preferences of the user for content items of the local collection and local attribute values associated with the content items of the local collection, each local attribute value being based on interactions of the user with at least one content item of the local collection corresponding to the local attribute value.
18. The system of claim 17 , wherein the keyword and the search input belong to the dataspace, and the dataspace is one of contacts, e-mail, website, music, and applications.