Linh Son company: + Investment project to build a plastic packaging factory
+ A total of 13 bids were sent, of which 5 were satisfactory from Linh Son company
- Hama company: + Experienced in building many large factories
+ Built 8 big factories, highly rated wastewater treatment system

- Ngan Ha company: + There is a CEO who is the sister-in-law of the chairman of the board of directors
+ Newly established, built 3 small factories, including 1 slow down process

? Acting as the CEO of Ngan Ha company, giving reasons for Linh Son to choose as a contractor