In the English Vocabulary Profile at B2:
work at sth = to try hard to achieve something
A search in the NOW corpus for:
WORK at _VVG
1 WORK AT GETTING 170
2 WORK AT MAKING 156
3 WORKS AT EXPERIENCING 126
4 WORKING AT GETTING 118
5 WORK AT KEEPING 94
6 WORK AT BUILDING 83
7 WORK AT IMPROVING 76
8 WORKING AT MAKING 71
9 WORK AT REDUCING 64
10 WORKING AT ENSURING 63
The government of India is working at ensuring the right information is sent to people about the disease.
11 WORK AT FINDING 60
12 WORK AT CREATING 56
13 WORK AT ENSURING 52
14 WORK AT PREVENTING 49
15 WORKING AT IMPROVING 47
16 WORK AT DEVELOPING 39
17 WORK AT BECOMING 38
18 WORKING AT BUILDING 38
19 WORK AT TRYING 37
20 WORKED AT GETTING 36
21 WORKING AT BECOMING 34
22 WORK AT ACHIEVING 33
23 WORK AT CHANGING 33
24 WORKING AT FINDING 32
25 WORK AT BRINGING 31
26 WORK AT MAINTAINING 31
Regardless, they try to stay positive and work at maintaining their career.
27 WORKED AT MAKING 30
28 WORK AT HELPING 28
29 WORKING AT TRYING 27
30 WORK AT PUTTING 26
31 WORKING AT CREATING 26
32 WORKING AT REDUCING 26
33 WORKING AT DEVELOPING 25
34 WORK AT PROVIDING 24
35 WORK AT STRENGTHENING 24
36 WORKED AT IMPROVING 24
37 WORKED AT KEEPING 24
38 WORKING AT RESOLVING 24
39 WORKING AT UNDERSTANDING 24
40 WORKED AT LEADING 23
41 WORK AT STAYING 22
42 WORK AT RUNNING 20
43 WORK AT SOLVING 20
44 WORK AT ESTABLISHING 19
45 WORKING AT ACHIEVING 18
46 WORKS AT PROCESSING 18
47 WORK AT PROMOTING 17
48 WORK AT RAISING 17
49 WORKS AT KEEPING 17
50 WORK AT PLUGGING 16