Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc danh he snippets" » "quoc khanh he snippets", "cuon danh he snippets", "hoc danh he snippets", "quoc danh het snippets", "quoc dan he snippets", "quoc hanh 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: (((("quoc danh 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: (((("quoc danh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc danh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc danh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.