Search term count discrepancy

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I was checking the times Italy is searched :
Digitalpoint gives wordtracker results and overture:

According to overture the terms "italy travel" are searched more than
"Italy" - "Italy travel" is searched about 17.000/day vs 11,000/day  for
"Italy" alone
while on wordtracker "Italy travel" or "travel Italy" is searched only 280
times / day ?

Why such a huge discrepancy ?

Any idea ?


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