Sinense has a pretty broad distribution range throughout SE Asia, but mostly occurs in the subtropics. I mostly agree with what Roberta has laid out above, with a couple asides:
1.
sinense is far less dependent on low temps to initiate spike formation; it can be almost as free blooming as
ensifolium; that said, different varieties are known to bloom most frequently at different times of the year--Tao Ge, for example, usually blooms in the spring & summer, whereas Ri Xiang & Bai Mo are both autumn & winter bloomers. I suspect it stems from where over the natural range the variety was initially collected.
2. Aside from light levels [and using a finer media], you can pretty much treat sinense as you would standard Cymbidiums, ie they will readily grow/flower under the same cultural conditions. I grow all of my Jensoa section cymbidiums [ie faberi, goeringii, ensifolium, sinense, tortisepalum, etc.] benched in the cold house with Standards. I can't speak to growing them in the house, as I grow them in the greenhouse, but they are generally forgiving culturally, provided you don't subject them to full sun or try growing them in overly coarse media.
Roberta hit the nail on the head in closing; give your plants a season [or two]; most of the imports that are available are pretty small divisions [ie 3-bulbs or less] and have insubstantial roots. It'll take most at least a season of new growths to bloom, for many another season besides--on the upside, many have interesting foliage to offset the wait [if it's any consolation, I have
goeringii benched that I received as single bulb divisions 15+ years ago, which are still plugging away, but have not yet bloomed...patience
]
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