|Hi Guyen, make and model of laptop?|
All the keys mentioned are in the same general area, if liquid is not the cause, try turning the laptop upside down and rattling all the keys, maybe a paper clip or something is underneath the keys that causing the problem.
Also while iinverted, blow out any dust from the kb, using a hairdryer set to cold and maximum blast.
If an external kb works as suggested trying by Guapo, then consider replacing the laptop kb. OEM ones are generally not expensive.
Youtube videos and/or fitting instructions can usually be found on the internet.
Please advise back on progress.
Good Luck - Keep us posted.