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: VANECK FUNDS N-Q filings
Market Vectors ETFs: MARKET VECTORS N-Q filings
VanEck VIP (formerly Worldwide) Insurance Funds: VanEck VIP INSURANCE FUNDS N-Q filings