Dưới đây là những từ phù hợp để điền vào chỗ trống trong đoạn văn:

1. **experience** (kinh nghiệm)
2. **with** (các máy dệt)
3. **quality** (chất lượng)

Vậy cả đoạn văn sẽ như sau:

Tran Thi Bach Tuyet, who has 40-year **experience** in making mats, said that in the past people made mats by the traditional method so they only earned about 1.5 million VND per month. Now many households have invested **with** weaving machines that help increase the production and **quality** of the products. Therefore, their income is much higher than before, sometimes reaching 12-15 million VND per month. Each employee who can weave 4 to 5 pairs of mats a day can earn tens VND per month.