there is an issue with the format of the queries when creating a corpus: For instance on IsTex basics:

• honey bees pesticides : WORKS
• "honey bees" AND pesticides : Does not work There is an issue with the " format used.

It seems the same bug is happening for the pubmed queries:

• cancer AND tobacco : WORKS
• "blood cancer" : does not work I guess there is an issue with the format of " used from the frontend