Perhaps you should try some spelling variations:
"danh cao sio2 snippets" » "doanh cao sio2 snippets", "danh cho sio2 snippets", "danh ca sio2 snippets", "danh bao sio2 snippets", "danh cao son snippets", "danh cao so snippets", "danh cao 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"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("danh cao 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: (((("danh cao sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh cao sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh cao sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.