The phrase "a substantial and powerful" is correct and usable in written English.
It can be used to describe something that has significant impact or influence, often in a positive context.
Example: "The research presented a substantial and powerful argument for the need for policy change."
Alternatives: "a significant and strong" or "a considerable and influential".
A learning centre sounds good, except that it would be less than a mile away from the sober, substantial and powerful Holocaust exhibition at the Imperial War Museum.
Mr. Berger called the sanctions "fairly substantial and powerful" and said that the Administration would wait to gauge their effects before taking further steps against India over its tests today.
A substantial and satisfying volume.
The movement now includes a substantial body of powerful tribal figures as well as Aden-based intellectuals and political figures.
For months, Mr. Maliki, who once hoped to court a substantial alliance with powerful Sunni political blocs but was largely rebuffed, has repeatedly raised the specter of the Baath Party to justify a crackdown on Sunni and secular leaders.
Psychologists have discovered that people who move and speak slowly are generally seen as bigger, more substantial and more powerful – characteristics that the Republican was clearly doing his utmost to project throughout the entire debate.
A study was led by RSSB [7], the Rail Safety and Standard Board—a UK company which aims at providing knowledge, analysis and a substantial level of technical expertise, and powerful information and risk management tools researching into obstacle detection at LXs.
The growth of a wealthy and powerful bourgeoisie caused the building of more substantial houses and a demand for good furniture.
The stakes are substantial: the decisions we make now -- especially a decision to allow a rich and powerful industry to develop -- will be hard to change in the future.
