**Acknowledgements**

Financial support from Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant number 103.99–2015.17, the Ministry of Science and Technology, Taiwan under Contract Nos.: 103-2923-M-009-001-MY3, 103-2628-M-009-002-MY3, 103-2119-M-009-004-MY3, and the Ministry of Education (MOE-ATU plan at National Chiao Tung University) are gratefully acknowledged.
