Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van kieu toc snippets" » "van hieu toc snippets", "van kien toc snippets", "van kiem toc snippets", "van sieu toc snippets", "van kieu thu snippets", "van kieu ted 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 kieu toc 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 kieu toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van kieu toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van kieu toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.