SQL Most effective way to store every word in a document separately

Here's my situation (or see TLDR at bottom): I'm trying to make a system that will search for user entered words through several documents and return the documents that contain those words. The user(s) will be searching through thousands of documents, each of which will be 10 - 100+ pages long, and stored on a webserver. The solution I have right now is to store each unique word in a table with an ID (only maybe 120 000 relevant words in the English language), and then in a separate table store the word id, the document it is in, and the number of times it appears in that document. E.g: Document foo's text is abc abc def and document bar's text is abc def ghi Documents table will have id | name ``` 1 'foo' 2 'bar' ``` Words table: id | word ``` 1 'abc' 2 'def' 3 'ghi' ``` Word Document table: word id | doc id | occurrences ``` 1 1 2 1 2 1 2 1 1 2 2 1 3 2 1 ``` As you can see when you have thousands of documents and each has thousands of unique words, the Word Document tables blows up very quickly and takes way too long to search through. TL;DR My question is this: How can I store searchable data from large documents in an SQL database, while retaining the ability to use my own search algorithm (I am aware SQL has one built in for .docs and pdfs) based on custom factors (like occurrence, as well as others) without having an outright massive table for all the entries linking each word to a document and its properties in that document? Sorry for the long read and thanks for any help!