私が知る限りでは、その理論に関するよい書物はない。の英語

To my knowledge, there are no good books on the theory.

As far as I know, there are no good books on the theory.

It may be so in theory, but not so in practice.

That can't be logical.

Theory and practice don't necessarily go together.

Theory and practice do not necessarily go together.

Theory and practice don't necessarily go together.

Theory and practice do not necessarily go together.

I think your theory does not hold water.

I can't think about that logically.

I don't mean to challenge your theory.

The theory is not accepted.

That theory isn't generally accepted.

Everybody else says that the theory is not correct.

That can't be logical.

It is a mere theory, and practically impossible―impracticable―unfeasible.

Theory is quite useless unless it works in practice.

The theory is not accepted yet.

I cannot follow your theory.

I wouldn't go so far as to say your theory is completely wrong.

This theory is too difficult for me to comprehend.

slovenly inconsiderate reasoning

Theory is quite useless unless it works in practice.

Theory without practice will be no use.

Things do not go by theory alone.

elaborate, as of theories and hypotheses

In theory, there is no difference between theory and practice. But, in practice, there is.

Theory does not go hand in hand with practice.

of character of a person, all talk and no action

You can't apply this theory to this case.