How do I prevent Odia characters from combining

[Pro Neon via Indic]

While writing in odia, I cannot place characters with halant and characters
without halant together.

For example:
    I cannot place କ୍ and ଖ together or else they will just combine to
form  କ୍ଖ .
But without putting halant in certain characters would make  the spelling
incorrect.
    Placing ଷ୍ଟାଡ଼ିୟମ୍ and ରେ together would automatically combines them
to  ଷ୍ଟାଡ଼ିୟମ୍ରେ
which is not what was supposed to be meant. How do I solve this?
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