Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong tan den snippets" » "cong tac den snippets", "cong san den snippets", "cong thanh den snippets", "cong ban den snippets", "cong dan den snippets", "cong van den 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: (((("cong tan 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: (((("cong tan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong tan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong tan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.