Tags Vietnam Blue-chip Investment Fund (VF4) Tech stocks contribute 48 per cent to VF4 profit Monday, Mar 30, 2015 The Vietnam Blue-chip Investment Fund (VF4) reported a total profit of VND67 billion (US$3.1 million) last year, lifting its net asset value (NAV) to nearly VND8,977 ($0.42) per fund certificate by the year''s end.