Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thuat do hoc snippets" » "thuat o hoc snippets", "thuat co hoc snippets", "thuat do hoa snippets", "thuat du hoc 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: (((("thuat do 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: (((("thuat do hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thuat do hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thuat do hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.