Just because you have not seen any parasites coming out does not mean that the combination you are using isn't 'working'. Only a few of the many parasites in the intestine are large enough to see without magnification. Some are going to disintigrate, others you may not recognize. The only times I have seen actual parasites was when I did Liver Flushes after taking the parasite killing preparations. Besides many of the parasites which are living in your body are not in the intestine but are in other parts of the body. Also the combination you are taking is not effective for Tapeworms and generally not as effective as some other herb mixtures for intestinal worms.
When a person does not have a significant improvement after taking parasite herbs then it is a good idea to look for other causes of your problems.