The original manuscript is extant here and reads might in “that ye might learn wisdom”. When Oliver Cowdery copied the text from 𝓞 into 𝓟, he mistakenly replaced might with may, undoubtedly because of the may in the following clause, “that ye may learn of me”. For a list of other cases where may and might have been mixed up in the history of the text, see under Jacob 5:13.
Summary: Restore might, the reading of the original manuscript in Alma 38:9: “that ye might learn wisdom”.