Google Adwords team has intimated that they are working on Adword campaigns so that advertisement(ad) will show when someone searches for close variants of your exact match and phrase match keyword. In mid-May, your exact match and phrase match keywords will automatically be eligible to show your ads for close variants. . The below example screenshot will make things easier to understand.
However if you do not want variant matching to take place as it will increase your clicks and subsequently cost also, please follow below method as shown in screenshot.
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