Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoang son dk snippets" » "hoang van dk snippets", "lang son dk snippets", "giang son dk snippets", "hoang so dk snippets", "hoang son d snippets", "hoang son da 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: (((("hoang son dk snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoang son dk snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoang son dk snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoang son dk snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.