Do all researches need a theoretical framework?

the theoretical framework is supposed to help the reader make logical sense of the relationships of the variables and factors that have been deemed relevant/important to the problem. It provides a definition of relationships between all the variables so the reader can understand the theorized relationships between them.

Or,

A theoretical framework is a collection of interrelated concepts, like a theory but not necessarily so well worked-out. A theoretical framework guides your research, determining what things you will measure, and what statistical relationships you will look for.