Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van khu doan snippets" » "van kieu doan snippets", "van khu do snippets", "van thi doan snippets", "van khuc doan snippets", "van phu doan snippets", "van khi doan 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 khu doan 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 khu doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khu doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khu doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.