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Can I enter more topics into 1 search field (dimension) ?

Yes ! You can assign more than one topic into a dimension field, unless it is designed to be assigned just single one.

Every topic is ended with a semicolon character. This marks a new starting point for searching of an additional topic. Simply after the last semicolon, enter again new 3-4 characters to search for an additional topic from the topic dictionary or from the topic tree, as if the dimension field was empty in the beginning.

Be aware, that if you enter more than 1 topic into any of search fields, the evaluation is set to AND, i.e. only card that were assigned all of the given topics will be returned into Query results.
If you need OR, then please, notify the Application owner of such a use case. An effort will be performed to bring this option.