id	keyword
ertr-470	tourism
ertr-470	online
ertr-470	tourism services
ertr-470	tourism research
ertr-470	purchase
ertr-470	travel
ertr-470	purchasing
ertr-470	review
ertr-470	searching
ertr-470	use
ertr-470	vol
ertr-470	ertr
ertr-470	trust
ertr-470	information
ertr-470	ease
ertr-470	internet