Q: Why can't I find my Google Adwords ad?
1) Daily budget has been reached / limited daily budget
AdWords displays your ads as often as possible while staying within your daily budget. When the budget limit is reached, your ads will typically stop showing for that day.
2) Searching for your own ad on Google
If you repeatedly search for your own ad on Google Search but never click on it, you may stop seeing it. That's because Google's system recognizes your computer and stops showing you ads that it thinks you aren't interested in. Remember to use the Ad Preview and Diagnosis tool (http://adwords.google.com/d/AdPreview/?__u=1000000000&__c=1000000000) to view your ad as it appears in Google search results instead of performing a regular search. It prevents you from racking up impressions while you try to locate your ad.
3) Include keywords that you are targetting on your Website. This improves your Ad Rank.
If your ads Ad Rank is too low, your ad may not show as frequently as you'd like -- or may not show at all -- because the other ads that are currently showing on the page having higher Ad Rank than your ad, or because your Ad Rank does not meet Google's minimum threshold for ad placement, or your budget would be greatly exceeded if you served at every opportunity.
Ways to counter this:
1) Increase daily budget / Find your campaign's recommended budget
2) Choose "Standard delivery" for ads instead of "Accelerated delivery"
3) Lower bids for campaigns that are "limited by budget", potentially reducing avg cost-per-click
4) Let AdWords automatically bid for you to get as many clicks as possible with your campaign's current daily budget.
5) Add targetted keywords on your Landing/Destination Page