'limited efforts' is a correct and usable phrase in written English.
It typically means that one has only been able to put forth a certain amount of energy or thought into a situation. For example, "Despite our limited efforts, we were unable to save the lost hiker."
Still, the Pakistani government's reluctance to provide access has limited efforts to assess the situation.
Rain and landslides have limited efforts to rescue the victims of floods in the northern Indian state of Uttarakhand.
There are various works in producing SRC; however, there are limited efforts to develop the optimization of cooking process parameters.
The investigation found that after the initial complaint, the police made "only limited efforts to apprehend a potentially violent sex offender".
At the state level, all states maintain a crime-lab system, though there have been limited efforts at coordination and regional planning between states.
This has greatly limited efforts to develop and maintain operational, repeat forest inventory on the ground.
Instead, the proposed rules would have only limited efforts by ISPs to enter the market for Internet advertising.
Most marketplaces are limited efforts so far – Nordstrom launched with 8 stores and Macy's currently has 12 – so the pressure on brands isn't too heavy.
Acoustic methods have been used more by researchers to monitor bat populations, but poor standardisation has limited efforts to collate EU-wide data.
A stronger Brown, he argues, might have limited efforts to minimize the decision's impact and it might have opened greater opportunities for successful racial integration.
According to the charges, the bank limited efforts to "market the full range of loan products and services" to its designated trade area.
