Hi (Eric?),

In Swedish and other Scandinavian languages diacritic letters are not
just umlauts, but are actually new letters and compose new words.

We have noticed strange search volumes for keywords with diacritic
characters (in Swedish: åäö) that should have fairly large search
volumes in the localized targeting Sweden/Swedish. This problem is
probably common in several other languages with other diacritic
characters, but we are mainly interested in Swedish keywords.

One example is 'friskvård' (meaning health care) which is collated to
'friskvard' (nonsense). There are other examples where the collation
of non latin characters change the meaning of the word completely,
e.g. 'väder' (weather) vs. 'vader' (calfs) or 'hål' (hole) vs.
'hal' (slippery).

For the example 'friskvard/friskvård' there are 12 local monthly
searches using exact match, but for the less generic keyword
'friskvård uppsala' (where Uppsala is a city) there are 880 local
monthly searches using the same matching. One could argue that the
search volumes actually are correct, but we think it is very
improbable.

The following localized searches suffixed by the 5 largest Swedish
cities (ordered by population size) have suspiciously low or missing
search volumes for "diacritically challenged" keywords:

'catering stockholm' - 74000
'catering göteborg' - n/a
'catering malmö' - n/a
'catering uppsala' - 12100
'catering västerås' - 320

Since we fail to retrieve local search volumes for exact matching,
this might be a different problem, but we suspect the non latin
character collation here as well. Two keywords that seem to deviate
from this problem and have reasonable search volumes are 'catering
örebro' and 'catering norrköping'.

All problems are reproducible in the online AdWords keyword tool, so
it's not an API or client specific problem.

Best regards
--
Martin

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