Question: Why challenges does word segmentation in Vietnamese pose?

Evidence:
raw_evidence: There are several challenges on supervised learning approaches in future work. The first challenge is to acquire very large Vietnamese corpus and to use them in building a classifier, which could further improve accuracy. In addition, applying linguistics knowledge on word context to extract useful features also enhances prediction performance. The second challenge is design and development of big data warehouse and analytic framework for Vietnamese documents, which corresponds to the rapid and continuous growth of gigantic volume of articles and/or documents from Web 2.0 applications, such as, Facebook, Twitter, and so on. It should be addressed that there are many kinds of Vietnamese documents, for example, Han - Nom documents and old and modern Vietnamese documents that are essential and still needs further analysis. According to our study, there is no a powerful Vietnamese language processing used for processing Vietnamese big data as well as understanding such language. The final challenge relates to building a system, which is able to incrementally learn new corpora and interactively process feedback. In particular, it is feasible to build an advance NLP system for Vietnamese based on Hadoop platform to improve system performance and to address existing limitations.
raw_evidence: There are several challenges on supervised learning approaches in future work. The first challenge is to acquire very large Vietnamese corpus and to use them in building a classifier, which could further improve accuracy. In addition, applying linguistics knowledge on word context to extract useful features also enhances prediction performance. The second challenge is design and development of big data warehouse and analytic framework for Vietnamese documents, which corresponds to the rapid and continuous growth of gigantic volume of articles and/or documents from Web 2.0 applications, such as, Facebook, Twitter, and so on. It should be addressed that there are many kinds of Vietnamese documents, for example, Han - Nom documents and old and modern Vietnamese documents that are essential and still needs further analysis. According to our study, there is no a powerful Vietnamese language processing used for processing Vietnamese big data as well as understanding such language. The final challenge relates to building a system, which is able to incrementally learn new corpora and interactively process feedback. In particular, it is feasible to build an advance NLP system for Vietnamese based on Hadoop platform to improve system performance and to address existing limitations.

Answers:
Acquire very large Vietnamese corpus and build a classifier with it, design a develop a big data warehouse and analytic framework, build a system to incrementally learn new corpora and interactively process feedback.
to acquire very large Vietnamese corpus and to use them in building a classifier,  design and development of big data warehouse and analytic framework for Vietnamese documents, to building a system, which is able to incrementally learn new corpora and interactively process feedback