Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van gi he snippets" » "van gia he snippets", "van ai he snippets", "van giao he snippets", "van gi de snippets", "van gi ve snippets", "van vi he 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 gi 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 gi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van gi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van gi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.