Perhaps you should try some spelling variations:
functional differential » fractional differential (Expand Search), functional differentiation (Expand Search), functional differences (Expand Search)
stochastic parabolic » stochastic hyperbolic (Expand Search), viscoelastic parabolic (Expand Search), stochastic partial (Expand Search)
stochastic portfolio » stochastic partial (Expand Search), domestic portfolio (Expand Search), stochastic profit (Expand Search)
equations" » equation" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: ((stochastic parabolic) OR (stochastic portfolio)) functional differential equations.