Perhaps you should try some spelling variations:
"toc trinh do snippets" » "doc trinh do snippets", "hoc trinh do snippets", "tra trinh do snippets", "toc trinh ky snippets"
"python using sat snippets" » "python using data snippets", "python using a snippets", "python using raw snippets"
"locating bug code snippets" » "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: (((("toc trinh do snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc trinh do snippets") OR ("python using sat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc trinh do snippets ) or ( python using sat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc trinh do snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))*.