Issue with space in PostgreSQL Full Text Search filter

Describe the bug
It's awesome that this library added full text search but I seem to be having a problem when I do a filter with a space.
The issue is created when using the __search filter on any model when the value contains a space.

To Reproduce
Using a basic account model the below filter will generate SQL similar to below. The search will work until a space is added.

Account.filter(name__search="test name")

SELECT "accounts"."name" FROM "accounts" WHERE (TO_TSVECTOR("accounts"."name") @@ TO_TSQUERY('test name') OR "accounts"."name"='test name')

This will throw the following error as its not valid in PostgreSQL.

tortoise.exceptions.OperationalError: syntax error in tsquery: "test name"

Expected behaviour
I believe when a query runs it should add in either a & or | between words to make the query valid. I have tested the query with a & added between words and it works correctly.

References
https://stackoverflow.com/questions/46936417/unable-to-fetch-a-word-containing-spaces-using-to-tsvector-and-to-tsquery
https://stackoverflow.com/questions/16465466/postgres-search-query-error-if-space-used/16466057

The docs are slightly limited and I know its a new feature so just let me know if I am just using it wrong.

Start by reproducing Account.filter(name__search="test name") and trace the __search filter's PostgreSQL SQL generation. Compare the generated TO_TSQUERY input with the working query that places an operator between words. Done means a spaced search produces valid PostgreSQL SQL without the reported syntax error.