visa to Hong kong .

Hi my name apple.
i want to go hong kong for travel ,about one week .,i am PR singapore now ,but holding vietnam passport .i want to know information about visa to hong kong .

i have some question dont understand ,please ...who can answer me as below question, thanks !

as below requirements the
5. Original invitation letter, proof of employment and company leave letter.
>>>>this Original invitation is talking about what ?it mean need hong kong invitation?but i am going travel ,so no any people invitation me.so what can i do?

7. Round trip airline ticket and hotel reservation.
>>>>this one i dont know visa can pass or not ?so how can i provide airline ticket and hotel reservation?



Requirements are:

1. One completely filled out visa application forrm.(click to download. Hong Kong Visa Application Form Download )

2. One recently taken 2X2 inch photo showing entire face and without a hat on. Please affix the photo to the application form.

3. Original passport with at least 2 blank visa pages and valid for at least 6 months beyond the date of application.

4. Original and copy of the residence permit (e.g. PR, EP).

5. Original invitation letter, proof of employment and company leave letter.

6. Bank statements within 3 months.

7. Round trip airline ticket and hotel reservation