DISCO strips out most punctuation from a search query and therefore does not recognize hyphens. For example, you would receive the same search results if you were to search "re-do" or "redo".
However, fuzzy searching will do the trick. A fuzzy search (~) is a command that calls up results that contain minor spelling variations. If you were to search "guaranty~", the word guaranty, or words similar to guaranty, like guarantee or guaranty would appear as a result. Similarity is between 0 and 1 and defaults to 0.5. You can set the fuzzy search similarity directly after the tilda. For example, you could search "guaranty~0.8".