Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"can nhan hoc snippets" » "chan nhan hoc snippets", "ca nhan hoc snippets", "van nhan hoc snippets", "can nha hoc snippets", "can nhan hoa snippets", "can than 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: (((("can nhan 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: (((("can nhan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( can nhan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("can nhan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.