A user might want to retrieve documents about 'seol'agsan(Seol'ag Mountain)', and then it is likely that the documents with seol'agsan-gugrib-gongwon' are also the ones in his interest.
it should be exactly segmented before indexing in order for the documents to be retrieved with the query Morphological analysis is crucial for processing the agglutinative language like Korean since words in such languages have lots of morphological variants.