I dont know, the qing extermination of dzunghars and replacement with ughyers and han resembles colonization.
In fact right now the modern economic historical consensus is that China did indeed colonize except its colonization efforts were focused towards the steppes and tibet due to the perceived threat the qing feared from the actions of these regions. The reason they didnt focus on the pacific was that they were too busy in the west and not to mention with rebbelions, unrest, and other issues as well as warfare with ming particularists(early on) and growing population making beurocracy and adminstration further difficult meant that the qing were in no position to colonize the new world.
As others have mentioned they also had that tributary empire of theirs.
But to say they didnt feel conquest was a good idea is flat out wrong. The qing did think conquest was a good idea so long as it served their defensive interests. Geography, logistics, population, internal unrest and Russia stopped them expanding further.