The representatives of a group calling itself People's Movement for a Just Society who met with the premier said the three major problems have been pending for years without solutions or any sign of progress.
Another one hundred activists with banners and loudspeakers demonstrated at a side entrance of Government House.
Ms Yingluck said she has set up working committees to resolve the problems, admitting that some of the issues--particularly land disputes--involved law enforcement.
She said more discussions on the issues are needed while the activists urged the premier to chair the committees she mentioned since the people are in great trouble.
They cited the issuance of community land title deeds as one the most crucial problems.