Although more scientific studies are needed, onion juice may promote hair growth in patients who suffer from alopecia areata. According to a small study of 23 participants, applying crude onion juice to the scalp twice a day promoted hair regrowth within six weeks in 20 participants.  Although this study was done in patient with alopecia areata, you may want to give it a try if you suffer from androgenic alopecia. Extract onion juice by grating an onion and then straining the juice. Apply onion juice to your scalp twice a day for 30 min, then wash off. Try this for at least six weeks to see if this natural method will help your hair loss. Massaging your scalp will increase blood flow to the hair follicles, which can promote scalp health and strengthen your hair’s roots. However, this method has not been scientifically proven to reduce or prevent hair loss and you should try it with that in mind.  Use coconut or almond hair oil, or other oils such as olive, castor, or amla (Indian gooseberry) oil. Optionally, you can add a few drops of rosemary oil or lavender oil to make a mixture. Apply the oil by lightly massaging it into your hair and scalp. If you are using coconut oil, do not try to melt the oil using a microwave, use your hands instead. Coconut oil does not need much heat to melt. Repeat at least twice a week for a minimum of two months to see some results. Fenugreek (also called methi) seeds contain ingredients that may stimulate hair growth and enhance rebuilding of hair follicles.  Mix one cup of fenugreek seeds and water. Let it soak overnight. Grind the mixture and make a paste that you then can apply to your hair. Cover with a plastic bag or shower cap and let it sit for about 40 minutes. Rinse your hair and repeat every morning for a month. As with the other natural therapies for hair loss, this method has not been scientifically proven to reduce or prevent hair loss and it might not work for you. There are numerous other home or natural remedies you can try. However, keep in mind that these are...

How would you rephrase that briefly using Vietnamese?
Sử dụng nước cốt hành tây. Xoa bóp da đầu. Sử dụng hỗn hợp làm từ hạt cỏ cari. Áp dụng cách điều trị tại nhà.