Perhaps you should try some spelling variations:
"think layer chromatography" » "think gas chromatography", "thin layer chromatography", "thick layer chromatography", "think later chromatography"
"black liquid chromatography" » "black lipid chromatography", "black liquor chromatography", "placed liquid chromatography"
"tank liquid chromatography" » "tandem liquid 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: (("think layer chromatography") OR ((("tank liquid chromatography") OR ("black liquid chromatography")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"think layer chromatography\") or (((\"tank liquid chromatography\") OR (\"black liquid chromatography\"))))".
• Removing quotes may allow a broader search: (( think layer chromatography ) or ((( tank liquid chromatography ) OR ( black liquid chromatography )))).
• Adding a wildcard symbol may retrieve word variants: (("think layer chromatography") or ((("tank liquid chromatography") OR ("black liquid chromatography"))))*.