Needs small tweaks. Although Chinese poems only have 4 to 8 lines, you can still have a deep sense of happiness or sadness. or Although a Chinese poem only has 4 to 8 lines, you can still have a deep sense of happiness or sadness. Going even further, .. Although a Chinese poem might only have 4 to 8 lines, you can still have a deep sense of happiness or sadness (from it). Although a Chinese poem might only have 4 to 8 lines, it can still give you a deep sense of happiness or sadness.

"Although a Chinese poem only has four to eight lines, it can convey a deep sense of happiness or sadness." (not "having a sense of happiness", "still" doesn't add anything )

Although a Chinese poem only has four to eight lines, it can still have a deep sense of happiness or sadness.