Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"len duong he snippets" » "tren duong he snippets", "con duong he snippets", "van duong he snippets", "len duong che snippets", "len dung he snippets", "len duong ve 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: (((("len duong 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: (((("len duong he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( len duong he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("len duong he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.