Perhaps you should try some spelling variations:
"doi trong sio2 snippets" » "doi trong sinh snippets", "doi trong gio snippets", "doi tuong sio2 snippets", "dot trong sio2 snippets", "dong trong sio2 snippets", "doi trong sio2 slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doi trong sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi trong sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi trong sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi trong sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.