CONTAINSTABLE returns empty table

Hello,

I am using CONTAINSTABLE with 5 tables join.

Now, problem is that when anyone table is empty then It does not check remaining tables and returns empty table.

For example,

CONTAINSTABLE(tables1, column, '') INNER JOIN CONTAINSTABLE(table2, column, '') INNER JOIN CONTAINSTABLE(table3, column, '') INNER JOIN CONTAINSTABLE(table4, column, '')

Now, if table1 does not contain search data then it wont check for table2, table3 and table4 and it will return empty table. Same for anyone table.

How to prevent this problem ?