Order of precedence Active Record

[eluser]chinedubond[/eluser]
I HAVE THIS PROBLEM

Code:

$this->db->like('companyname',$keyword);
        
        $this->db->or_like('keywords',$keyword);
        $this->db->where('city',$city);
        
        $this->db->orderby('companyname');
$this->db->get('ng_city');

it produces select * from ng_city where city='somecity' and companyname like '%somecompany%' or keywords like '%somekeyword%';

The problem is the query searches city and companyname if true then searches keywords

i don't want that.What i want is a situation where i can get the active record to produce this result.

Code:

select * from ng_city where city='somecity' and ( companyname like '%somecompany%' or keywords like '%somekeyword%');

This way the result of keywords and companyname is produced first before compared with city.
Please how can achieve this with active record.
Thank you.