(VOVworld) - Party leader Nguyen Phu Trong has hailed Marxism- Leninism and Ho Chi Minh thoughts as guiding principles in the leadership of members of the Party Central Committee, who held key strategic positions. Speaking at the closing ceremony of their training course on Friday, the Party leader informed participants of key missions this year and urged them to study more and apply in work.  He said the course organizers should listen to participants' feedback to improve the training quality in future courses.