Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van di toi snippets" » "van dip toi snippets", "van dai toi snippets", "van doi toi snippets", "van di hoi snippets", "van di roi 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: (((("van di toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van di toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van di toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van di toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.