Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"len cho hoc snippets" » "len choi hoc snippets", "nen cho hoc snippets", "ben cho hoc snippets", "len co hoc snippets", "len khoa 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: (((("len cho 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: (((("len cho hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( len cho hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("len cho hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.