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Hello María PaulaStacchiola,
This is a great question. Using your examples, it looks like these keywords are already competing against themselves assuming that the ad groups are using the same targeting and the only difference are keywords like “hello”, “he.llo”, and, “h.e.llo” that are essentially running as duplicate keywords*.* This is because the punctuation (.) is ignored and three of your four keyword examples are being normalized as “Hello” (explained more in detail here), the only exception is the keyword ““h.e. llo” which will be normalized as “he llo”.
It sounds like the best idea in this case may be to condense “Hello” and “He llo” and additional variations of this keyword within the same ad group since it sounds like all three ad groups are using the same targeting settings.
This will prevent the keywords from competing against each other plus it will avoid having duplicate keywords within the same ad group as well. If the ad group’s targeting options are not the same as, or overlapping each other, it may boil down to the actual searches from your designated areas as well other factors such as CTR and other competitors bidding on your same keywords within your intended areas.
I would usually only suggest using the same keywords in different ad groups with similar targeting only if you intend to compare the performance of the same keyword across each match type (an ad group for phrase, and ad group for exact, and an ad ad group for broad).
If you have any additional questions I would highly recommend contacting our support team since we cannot go into account specifics on our public forums. You may contact us at 1-800-518-5689 so that we can go over you or your client’s account in detail.
Thank you for choose Bing Ads!
Darin P.