FilterList with ion-select - more than one option

Ionic Framework
1

How can i all of Items from my List with ion-select filter ? Can somebody help me? Thank you

Code
IONIC home.ts

— / ion-select filter only one item from the List \ –
this.filteredListModel$ = Observable.from(this.list)
.filter((i) => { return _value.indexOf(i.model) !== -1 })
.toArray()