It will not work in search box, as Kindle uses fuzzy search. However it should work in a pop-up box, looking up highlighted word. At least it works on my Kindle Touch.
You could also experiment with "exact" keyword, but I don't see any difference when using it. See
Kindle Publishing Guidelance:
Quote:
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By default, the Kindle device uses a fuzzy algorithm for matching diacritics during word lookup. Languages that use contrastive diacritics to distinguish between distinct word forms should use the exact="yes" attribute in the <idx:iform /> tag to force exact match of diacritics during lookup.
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Also note that
Code:
<idx:key>..</idx:key>
tags are depreciated according to the guidelines.