Abstract
1. Introduction
2. Literature Review
2.1. Text mining
2.2. Opinion mining
2.3. Opinion mining techniques
2.4. Vietnamese text mining
3. Research methods
3.1. Data Collection
3.2. Data preprocessing
3.3. Lexicon-based model design
3.4. Machine learning model design
3.5. Hybrid model design
4. Experiment results
4.1. Lexicon-based opinion mining results
4.2. Machine learning based and hybrid model results
4.3. Application of opinion mining in hotel services industry
4.4. Discussions
5. Conclusions
References