Hi Pen,
Unlike the v13 KeywordToolService, the TargetingIdeaServices doesn't
separate out keywords that contain your search term (previously called
"related") and ones that don't (previously called "more to consider"),
and these are all returned by default. In the v201003 version of the
API you can use the IdeaTextMatchesSearchParameter to separate these
out, by specifying that the original keyword must be included or
excluded from the results.
http://code.google.com/apis/adwords/v2009/docs/reference/TargetingIdeaService.IdeaTextMatchesSearchParameter.html
Best,
- Eric Koleda, AdWords API Team