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