正如Wimpel所评论的，应该使用grepl()，它使用正则表达式（regex）来查找字符串向量中的模式。

df[grepl('.*good', df$grade), ]

将显示所需的数据框行。

library(tidyverse)

df <- tibble(
  grade = sample(c("bad", "moderate", "good", "very good"), 20, replace = TRUE)
)

df %>% 
  filter(str_detect(grade, "good"))

# A tibble: 9 × 1
  grade    
  <chr>    
1 very good
2 good     
3 very good
4 very good
5 very good
6 good     
7 good     
8 very good
9 very good