Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc cong den snippets" » "hoc co den snippets", "cac cong den snippets", "hoc dung den snippets", "hoc cuong den snippets", "hoc cong dan snippets", "hoc cong 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: (((("hoc cong den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc cong den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc cong den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc cong den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.