Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xac pham den snippets" » "tac pham den snippets", "san pham den snippets", "duc pham den snippets", "xac cham den snippets", "xac pham men snippets", "xac pham yen 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: (((("xac pham 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: (((("xac pham den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xac pham den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xac pham den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.