I spent a few/couple of/several days in Bulgaria.

[dwni1]

For example, I want to explain to my friend that I spent some time in Bulgaria.
Can I say to him
1 I spent a few days in Bulgaria.
2 I spent couple of days in Bulgaria.
3 I spent several days in Bulgaria.

 

[teechar]

1 I spent a few days in Bulgaria.

That's possible.

2 I spent a couple of days in Bulgaria.

With the correction, that's possible too.

3 I spent several days in Bulgaria.

That's okay too.
Note that "several" implies a longer period of time than "a couple" or "a few".

 

[emsr2d2]

For example, I want to explain to my friend that I spent some time in Bulgaria.
Can I say the following to him?

1. I spent a few days in Bulgaria.
2. I spent couple of days in Bulgaria.
3. I spent several days in Bulgaria.

Note my changes above, and that I have changed your thread title. Title should be unique and relevant to the thread, and it's best to use a whole sentence.