The list you provided does not provide any indication as to why the engines were cancelled.
WS-5
The project started in 1963. It was developed from H-5 bomer's WP-6 turbojet engine and was supposed to use on a new H-5 variant. The first engine for test was delivered in 1965 and WS-5 passed all its ground test in 1970. It was fixed on a H-5 bomber in 1971 but since China didn't have a test bed to test the performance of the engine in the high altitude at the time, the plane was not allowed to take off from the runway.
WS-6
The project started in 1964. It was assigned to power J-9 fighter. The first engine was put on the test bed in 1968. In 1980, it has past all ground test with thrust 12220kN, T/W ratio 5.93. But unfortunately, J-9 project was cancelled because PLAAF refused to continue funding a second generation fighter project. The J-9 team managed to find a new funder---the Q-6 strike fighter, a MiG-27 liked plane develope by HONGDU Aviation Industry Group LTD. In 1982, WS-6G reached its maximum trust 13830kN while the wight was reduced about 100kg. But Q-6 lost the competition with another indigenous strike fighter JH-7, which was developed by Xi’an Aircraft Industry (Group) Company Limited. The WS-6 project was terminated in 1984.
WS-9
Only 4 licensed copy of the Rolls-Royce Spey RB.168 Mk 202 was produced in 1979, using British material and these engines passed test bed test in China and UK in 1980. Then the project was halted becasue there was no plane using it untile late 1980s, the JH-7 strike fighter chose it. JH-7 didn't use WS-9 but the UK made spey sealed in warehouses in China and UK.
The so-called Qin Ling, or WS-9G, is developed or improved from WS-9 or spey turbofan engine. It was reportedly with thrust 9800kN and T/W ratio 6.5. Qin Lling is used on JH-7A, the newest variant of JH-7. Qin Ling was reportedly passed its desing-developing certification in 2003 and mass production certification in 2007.
WS-10/WS-10A
WS-10 is not a canceled project. Its just the concept demonstration phase of the project. It started in 1987. WS-10A was reportedly passed its design-deveopling certification in 2005.
Though there are a lot of rumors said how WS-10A is incompetence, but I have a impression that Rassia has not had any new contract selling AL-31F/FN engine to Chiina for years. I suppose anyone could harly imagine that Chiina has already stopped the mass production of J-10/11 fighters.