1. A method for identifying documents for enriching a statistical translation tool comprising: retrieving, by a processor, at least one source document which is responsive to a source language query; for each retrieved source document: extracting a set of text segments from the retrieved source document; translating the extracted text segments into target language segments with a statistical translation tool to be enriched; formulating target language queries based on the target language segments; for each of a plurality of the target language queries, retrieving a set of target documents responsive to the target language query; filtering the sets of retrieved target documents that are responsive to the target language queries, the filtering including identifying candidate documents which meet a selection criterion that is based on co-occurrence of a target document in a plurality of the sets; and comparing the candidate documents with the retrieved source document for determining whether any of the candidate documents match the source document.
2. The method of claim 1 , further comprising, where a candidate document is determined to match the source document, enriching the translation tool with aligned text fragments from matched source and target documents.