The Funds file their complete schedule of portfolio holdings with the Securities and Exchange Commission for the first and third quarters of each fiscal year on Form N-Q.
Below are the links to these filings on the SEC's website:
VANECK FUNDS N-Q filings
VanEck Vectors ETFs:
VANECK VECTORS N-Q filings
VanEck VIP (formerly Worldwide) Insurance Funds:
VanEck VIP INSURANCE FUNDS N-Q filings