Perhaps you should try some spelling variations:
centre model » centred model, centered model, centric model
wang qian » wang qiao, wang qin, wang liang
model ecm » model vecm, model em, model eelm
und sala » und salat, und sacra, und santa
ecm und » em und, behm und, beim und
kyi a » kai a
yi a » yi ta, i a, ii a

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang qian) or (tang li)) ((yi a) or (kyi a)) centre model ecm und sala ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang qian) OR (tang li)) ((yi a) OR (kyi a)) centre model ecm und sala ;.
• Adding a wildcard symbol may retrieve word variants: ((wang qian) or (tang li)) ((yi a) or (kyi a)) centre model ecm und sala ;*.