Expanding Breadth:

If you are running your ads correctly the availability of well targeted ads should
be what is limiting your spend.

If your ad spend is limited by a budget and you are ranking high for many of the
search terms lower your max bid to lower the position down to 3 to 7. In doing so
you will be able to show up on more search results and people who are looking at
the lower ad positions are more prequalified to buy.
Dynamic Keyword Insertion:

If you have a group of similar keywords that will still use the same body text you
can enable this feature by writing out your normal body text, and placing
{KeyWord: default keyword} in the title of the ad.

When the keyword matching the search is greater than 25 characters the default ad
title will show. Otherwise the ad will show the search term as the ad title. Also note
how I capitalized the K and W in keyword. This makes the words in your ad title
appear capitalized.

Having keywords in your title can help your title jump out at people and improve
click through rates.

Google now also allows you to pass the referring keyword trigger as a variable in
the actual destination URL. To pass the trigger keyword as a variable use
&kw={keyword}. You can also track whether the clicks came from Google
content ads or Google search ads by adding the following to your URL
referrer={ifsearch:GoogleAdWordsSearch}{ifcontent:GoogleAdWordsContent}.