If my total volume of entry clones and destination vector become 8 ul ( Invitrogen LR clonase protocol), then there is no room for adding TE buffer? What to do in that case?
I would try with and without TE. The buffer is probably important for the pH of the environment, especially if an enzyme is involved, but in my experience things do not always work as described in papers and you may discover something new by going off protocol. Good luck!