Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den mot hoc snippets" » "nen mot hoc snippets", "de mot hoc snippets", "dung mot hoc snippets", "den mon hoc snippets", "den mo hoc snippets", "den mot goc 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: (((("den mot 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: (((("den mot hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den mot hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den mot hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.