Well, I have to assume you don't have level 2 of farming yet. So your only hope it to get enough tech points so you can "buy" it. So, put your game speed down to 1/2 speed, put everyone but one villager on the table. Put the other villager to farming and as soon as she/he unloads the basket, drag him/her back to the bush, and keep hunting them mushrooms. Hopefully they will make it.

Good Luck