深耕細作 [－－细－]

Jyutping sam1 gaang1 sai3 zok3
Pinyin shēn gēng xì zuò

Definitions (CC-CEDICT)
  1. deep plowing and careful cultivation
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to develop deeply and thoroughly