The seclusion of his mountain sanctuary offer him a good opportunity to pursue and enjoy his lifelong passion in writing his books wholeheartedly at a leisurely pace . Upon requests from his readers and supporters , Khoo still travel once a month for a few days to " suntzunize " – a term he coined for sharing the wisdom of Sun Tzu 's strategies for success and happiness for his seminar and conference audiences . Khoo have " suntzunized " thousands of " pupils " of his clients , among whom was well @-@ known corporations like AIA , Cisco Systems , Citibank , Hewlett @-@ Packard , Intel , Johnson & Johnson , Port of Singapore Authority , among many others , and also government bodies such as the Prime Minister 's Office of Singapore , Brunei and Malaysia . To keep in touch with his readers , Khoo write monthly newsletters touching on contemporary issues using Sun Tzu 's perspective . While not travelling in the region to teach , he enjoy writing fiction and have had three fiction books published to date – Taikor , Mamasan and Nanyang .