Perhaps you should try some spelling variations:
later chromatography » paper chromatography, planar chromatography, layer chromatographic
layer chromatography » gas chromatography, liquid chromatography
date chromatography » dye chromatography, native chromatography, paper chromatography
think later » think faster, think leader, ink later
think layer » thin layer, thick layer, thick layers
think date » think data, thinks data, think case

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( think later chromatography ) OR ( think layer chromatography ))) OR ( think date chromatography )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( think later chromatography ) OR ( think layer chromatography ))) or ( think date chromatography ))".
• Adding a wildcard symbol may retrieve word variants: (((( think later chromatography ) OR ( think layer chromatography ))) or ( think date chromatography ))*.