===== Coherence =====
**What it is:** Ideas are organized logically and easy to understand.  
**What it’s for:** Readers can follow your message without effort.  
**Example:** One paragraph = one main idea.

===== Cohesion =====
**What it is:** Sentences are connected smoothly using linking words and references.  
**What it’s for:** Your writing flows naturally.  
**Example:** “However,” “Therefore,” “For example,” “This/That/These…”

===== Common tools =====
  * Linking words: however, because, therefore, in addition
  * Pronoun reference: it, they, this
  * Repetition control: use synonyms carefully

===== Hard words (Glossary) =====
  * *coherence* /kəʊˈhɪərəns/: tính mạch lạc
  * *cohesion* /kəʊˈhiːʒən/: tính liên kết
  * *reference* /ˈrefərəns/: tham chiếu (trỏ về)