Perhaps you should try some spelling variations:
"than larger chromatography" » "than paper chromatography", "than lapse chromatography", "than gel chromatography", "than later chromatography", "than anger chromatography", "than laser chromatography"
"thin layer chromatography" » "thin gas chromatography", "thin liquid chromatography", "think layer chromatography", "hin layer chromatography"

Try widening your search to All Fields.

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: (("thin layer chromatography") OR ("than larger chromatography")).
• Removing quotes may allow a broader search: (( thin layer chromatography ) or ( than larger chromatography )).
• Adding a wildcard symbol may retrieve word variants: (("thin layer chromatography") or ("than larger chromatography"))*.