thats strange. try searching multi-city as tpe-nrt // Hnd-hkg -tpe. and fixed date option. it has always been cheap for me unless pricing got changed. make sure you search for business save... also look around for tpe website promptional page.

also "cheap" reference i am making is to the economy class reference i am making is regular economy core type of class and not those ultra cheapo Q or O.. i think i pay about 8k hkd or there abouts