Some words in a node are not found, others are

Hi,
I have installed SearchAPI for the first time and have it up and running.
It returns search results but the strange thing is that from the same node with text it finds the node with some keywords from the text but not with other keywords from the same text.
I have attached a screen shot also but this is the text:

Vanaf de Vinkeveense plassen vaar je met de wijzers van de klok mee over de Angstel via Baambrugge naar Abcoude.

It finds this node if I use the words: klok, wijzers, Vinkeveense, plassen, Abcoude
But it does not find this node if I use the words: Angstel, Baambrugge

The Processor settings are configured to ignore case so that's not it. I also find words with uppercase letters when searching in lower case.

The text here is just an example, it is plain text, no special characters or code. I have copied and pasted it from the node source directly as you see it here.

I have no idea where to start searching for this behavior. I did search for this and found all kinds of articles that learned me a lot about Search API but not what could cause this behavior.

I am using Database Server by the way.

Hope someone can help me with this