here is an example of two keywords that don't return STATS information on the actual keyword (there are many more)
natural recovery supplement
grief (or any multi word keyword that includes grief). Actually, grief doesen't even return IDEAS.
Also quite often, the IDEAS results return numbers that very
significantly from the Google keyword planner. Below are the results
that I look for.
AttributeType::SEARCH_VOLUME,
AttributeType::AVERAGE_CPC,
AttributeType::COMPETITION
I just noticed also that the keyword planner doesn't like these two keywords.