\documentclass{article}
\usepackage[style=authoryear]{biblatex}
\addbibresource{biblatex-examples.bib}
\begin{document}
\textcite[See][,and references therein, for more.]{aksin}\par
\textcites(pre)(post)[See][,and references therein, for more.]{aksin}[See][,and references therein, for more.]{angenendt}\par
\parencite[See][,and references therein, for more.]{aksin}\par
\parencites(pre)(post)[See][,and references therein, for more.]{aksin}[See][,and references therein, for more.]{angenendt}\par
\end{document}