How std::move applied on function return value?

On testing the below code snippet, here i am taking one string vector and trying to return it with std::move(vector). If i am using member function signature like this std::vector<std::string>&& getVector() then its working fine. If i am using this std::vector<std::string>& getVector() then its not moving/clearing the vector contents.

Please let me know the correct move semantics to be followed. And please explain difference between both code.

Code :

#include <iostream>
#include <vector>
#include <string>

class VectorMoveDemo
{
public:
    void add(std::string item)
    {
        results_.push_back(item);
    }
    std::vector<std::string>& getVector()
    {
        return std::move(results_);
    }
private:
    std::vector<std::string> results_;
};

int main()
{
    VectorMoveDemo v;
    v.add("Hello ");

    std::cout << "First Time : " << "\n";
    std::vector<std::string> temp = v.getVector();
    for(auto &item : temp)
    {
        std::cout << item << "\n";
    }
    std::cout << "Second Time : " << "\n";

    v.add("World");

    std::vector<std::string> temp2 = v.getVector();
    for(auto &item : temp2)
    {
        std::cout << item << "\n";
    }
}

First:

std::vector<std::string>& getVector()
{
    return std::move(results_);
}

output :

First Time :
Hello
Second Time :
Hello
World

Second

std::vector<std::string>&& getVector()
{
    return std::move(results_);
}

output :

First Time :
Hello
Second Time :
Hello
World

Any help would be really appreciated.