When I google for a Dutch or an English concept, I do not find many search results in other languages. When your language is Swahili, it is not that good. I learned that adding the word "kwenye" makes all the difference when you want to restrict the results to Swahili.
Martin Benjamin showed me how he uses it to determine the preferred spelling for a word.
As you can see from the results, the spelling of "anuai" is much more frequent and can be considered the preferred spelling.