Thanks Kirk, that workaround makes some sense, but...
As stated in the Search Examples: "Terms enclosed in double quotes are searched as a single phrase".
From my search examples below it looks like double quotes makes the search hit on whole words only. A single phrase consist of whole words, I guess.
No matter what, the 'a' and 'å' seems to be interchangeable...?
The image ..1483 has the keyword "Tåge"
The image ..6154 has the keyword "Vester Thorup Klitplantage"
Search term 1483 6154
=========== ==== ====
tåge hit hit
"tåge" hit -
tage hit hit
"tage" hit -
Klitplantage - hit
"Klitplantage" - hit
Klitplantåge - hit note, 'Klitplantåge' is a non-existant word in Danish
"Klitplantåge" - hit
Thorup Klitplantåge - hit
"Thorup Klitplantåge" - hit
rup Klitplantåge - hit
"rup Klitplantåge" - -
BR Frank