Try using https://adwords.google.co.uk/select/...ingPreviewTool

It may be that you have searched for that term a whole bunch and Google has realised that you aren't interested in clicking on the ads, so they don't display correctly for you.

To answer your question about the standard/accelerated delivery option, it can be found in the campaign settings. Enter your campaign, then click edit campaign settings. From this page you can also set ad scheduling so you can set the campaign ads to run for certain times.

Hope that helps.