Perhaps you should try some spelling variations:
"doi tinh sio2 snippets" » "doi tinh son snippets", "doi tinh sinh snippets", "doi tinh so snippets", "doi trinh sio2 snippets", "hoi tinh sio2 snippets", "don tinh sio2 snippets", "doi tinh 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 tinh 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 tinh sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi tinh sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi tinh sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.