I mean In theory it should be good board to check raise i think becouse i can rep strong hands like 2pairs,sets,straights

Would you fire turn and give up river? I think the problem is that he may call me on the turn with hands like pair+ draw like T9,87,97,T7 etc do i think if i bet turn i have to follow up on the river on this board looking how many combos may call turn.

It's really really difficult to come up with a somewhat balanced value/bluff ratio on any street, but thinking about what your check/raise for value range looks like is a very good thing to do.

On this board I'd have 75s usually but I don't have T7s vs CO 3x open. That gives BB some nut advantage in straights because CO shouldn't be opening these hands. Sets are also on our range (99 might 3-bet pf). So overall is a flop where we can represent a good number of very strong hands.

CO might be betting a strong range on these bad flop for him or maybe he's betting everything, we are readless.

QJ with two suits of the board is a nice check-raise candidate, so I like the check-raise It would be a mixed strategy on equilibrium probably, we prefer QJs with BDFD to check raise more often. The turn is a very good card four your value check/raise range on the flop so you should size up with your range. You also want to give up some bluffs here, your value range isn't wider, and your XhYh are good candidates for bluffing on that turn with the picked up equity.

In theory you cannot continue betting with every QJ here or you will be very unbalanced, unless you want to exploit. QhJh is a very good continue, and the solver (I made a very quick and simple sim) probably check-folds the rest of QJ, except for QJ with a heart, and specially with a spade that unblocks bdfd hands from your opponent. Your particular combo bets less than 7% on my sim. That means that betting and check-folding have the same EV, so your opponent will dictate wich is better. I don't know if the population overfolds in CO vs that line in drawy boards, so I'd go with a somewhat balanced play, and pick the lower variance option: check-fold.

If your opponent has a lot of pair+draw combinations that might fold the river as you said you want good equity hands because your commiting two barrels and all your stack. Turned flush draws, OESDs (QT,JT,7x), hands like 76 (low pair+OESD), you have plenty of better equity bluffs.