1. Which keyword did you search for?
2. What time did you search for it?
3. Which Browser/Engine did you search for it?
There can be several reasons for not seeing your ads.
a) Your budget has depleted for the day. To resolve, you may consider increasing your daily budgets for a greater visibility.
b) Your campaign is not targeting the keyword that you have searched for. To resolve, please advise the keywords you'd like to see added into your campaign and we may have alternative recommendations.
c) You've been searching for your ad too often. To resolve, pls clear your cache or use a different browser to search again.
For the most effective way to diagnose if your campaign is running well, please use "Ad Preview & Diagnosis Tool" by requesting for a read-only access login to your Google AdWords account.