Thanks Fanis. I understand that the limit is for performance reasons and various tools support almost the same due the explosion in number of comparisons. Will look into synonyms. For now I have settled on a approach to generate misspellings (edit distance upto 4) and create synonyms for those.
On a separate note, Would you happen to have any resources that show the comparisions for num_typo 2/3 or more for typesense