Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc thu canh snippets" » "duc thuc hanh snippets", "duc thu cong snippets", "duc thu ban snippets", "duoc thu canh snippets", "duc tho canh snippets", "duc tu canh 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: (((("duc thu canh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc thu canh snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc thu canh snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc thu canh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.