On the other hand, the significance of this result is that if a measurement concepts (variables) implicit in many observed variables (variables measure) will increase the value and reliability of measurement and not necessarily measure the exact amount of such variables in this study. The observed variables can be adjusted and supplemented to suit each market and each specific industry. The reason is that each service has its own unique properties of it (Nguyen Dinh Tho & CTG 2003).
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