I already tried other kinds of ties but nothing seems to accomplish what I want to do.
I tried taut-line hitch, didn't work... the only way to tighten it is to pull the tied part and if apply force at the middle of the rope then It will just simply loosen..
There are several variants of hitches that allow tightening after they are tied. The most common is the taut-line hitch.
Wikipedia [citing more authoritative sources]
The Taut Line Hitch and the Trucker's Hitch are the most commonly used knot for this purpose.
If the taut line is slipping, make sure you tied the half hitch at the end in the proper direction. Also make sure you tightened the knot down enough. If it's still slipping, throw in a third turn on the inside and/or a half hitch on the outside.
Alternatively, you could use a Siberian Hitch on one end, and the knot shown in this YouTube video at 0:19 in (which I haven't been able to positively id yet). These have the advantage of being quick release.
Have you tried getting a Manila rope soaking wet tying it as tight as you can and then wait for it to shrink as it dries?
