"such a thorough" is a correct phrase and can be used in written English.
Example: The doctor performed such a thorough examination that he was able to accurately diagnose the patient's condition.
I think it's worth remembering why we originally commissioned such a thorough and independent report.
Things like this happen occasionally, and that is why we have developed such a thorough process.
For Mr. Bishoff did such a thorough job that the Chinese version is just like the English version.
One man said he got such a thorough dousing that he was wet down to his underwear.
Nowhere has withdrawn so swiftly from the global economy, nor seen such a thorough reversal of neo-liberal policies.
It was such a thorough demolition that the Spanish star Pau Gasol was asked in the postgame news conference whether his team had tanked the game.
However, the Bush White House did such a thorough job in ruining the word "freedom" that the organizers seem to be rethinking that.
The shows do not avoid the clichés of the medium, but instead do such a thorough make-over of them that the clichés are transformed.
Astounding to have had such a thorough backlash and online kicking and festival of trash talk for something which doesn't yet exist.
So will Stifler's mom (Ms. Coolidge), the wanton Mrs. Robinson who gave young Oz (Mr. Klein) such a thorough initiation the first time around.
Mao's legacy overshadows China to this day, so "without such a thorough verdict, it would be hard for China to launch meaningful political reform," Mr. Liu said.
