The phrase "hampering the efforts" is correct and can be used in written English.
Example sentence: The severe weather is hampering the efforts of the relief team.
But poor weather was apparently hampering the efforts, with helicopters unable to reach the base camp.
Cell phone service, too, was spotty, hampering the efforts of people to get in touch with relatives and friends and tell them that they were all right.
The paper is accused, among other things, of hampering the efforts of schools to bring their pupils to a decent standard of English.
The UN's agency for refugees, UNHCR, has budgeted over $64m for the winter, including money to help half a million families inside Syria, but fighting is hampering the efforts.
The administration argued that the treaty would make America safer by hampering the efforts of Russia, China and others to produce new, more threatening nuclear weapons and by strengthening support for the Nuclear Non-Proliferation Treaty, the main anti-proliferation effort.
The proposal was rejected by CNET, and a number of anti-takeover provisions are hampering the efforts of the consortium to get control of the board.
China and India are also "hampering the effort to ratchet up sanctions on Iran," the editorial says.
For gynecologic cancers in particular, a severe lack of accurate biomarkers is hampering the effort to improve screening procedures.
And it contends that the country hampered the efforts of inspectors to explore the suspect facilities.
High seas, strong currents, poor visibility and the sub's position hampered the efforts.
Three helicopters tried to rescue residents from above, but flames and thick black smoke hampered the efforts, Xinhua said.
