how can i select from table using many string values from text box?

how can i select from table using many string values from text box?
create table mytable( country varchar(30), city varchar(30))
insert into mytable values('Ethiopia','Addis Ababa')
insert into mytable values('Kenya','Nairobi')
insert into mytable values('France','Paris')
insert into mytable values('Japan','Tokyo')
then i have a text box that receives countries.
when i try to enter Ethiopia kenya,
i will expect to get Addis Ababa Kenya,
if i enter France Japan Ethiopia,
i will expect to get Paris Tokyo Addis Ababa
I think all this has done using split if i am not wrong.
so could you show me how can i select such conditions?
note that the value of textbox is more than one countries,
but i know when the value of textbox is one country only.
dim str as string
str="select city from mytable where country=' "&textbox1.text&" '"

my problem when i try to enter two or more countries name at same time.
sorry for posting again!
your help is crucial 4 me!
thanks

See the other post. Please flag the wrong posts (and I'm not sure but the owner of the thread can delete it as well).

Below is code that should do this - but beware, it will need tweaking to be more resiliant to user input - however, it should give you a basis.

Code:

---

        Dim searchString As String
        searchString = "'" & Replace(TextBox1.Text, " ", "','") & "'"

        Dim sql As String
        sql = "SELECT city FROM mytable WHERE country IN (" & searchString & ")"

---

Hello Slaine!
Thanks your answer works fine!