Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cau he snippets" » "van dau he snippets", "van hau he snippets", "van chat he snippets", "van cac he snippets", "van cau ha snippets", "van cau de 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 cau he 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 cau he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cau he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cau he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.