building a search functionality

I am trying to search account table by providing a search string. I am building a query based in different conditions and then adding the returned records in a list.

The functionality is working correctly but I want to know how an below method be further optimized.

 public PageReference search(){ clear(); runningUserId = Userinfo.getUserId(); String searchquery; Boolean existUser = AccSearchAccess__c.getValues(runningUserId) !=null? true : false; if(existUser){ searchquery='Select Name,Id,AccessLevel__c FROM Account where Name like \'%'+accountName+'%\''; } else{ set<id> accountIds = new set<id>(); List<WMAccess__c> wmaLst = [Select id,Account__c from WMAccess__c where WM_User__c = : UserInfo.getUserId()]; for(WMAccess__c wm : wmaLst){ accountIds.add(wm.Account__c); } if(!accountIds.isEmpty()){ searchquery='Select Name,Id,AccessLevel__c FROM Account where Name like \'%'+accountName+'%\' AND id IN:accountIds'; } } accList= Database.query(searchquery); if(accList.size()>0) for(Account acc : accList){ AccountWrapper aw = new AccountWrapper(acc, false); aw.accountId = acc.id; aw.accountName = acc.Name; aw.accountAccess = acc.AccessLevel__c; accountsList.add(aw); } return null; }