Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu bac hoc snippets" » "ngu cac hoc snippets", "ngu ba hoc snippets", "nguoi bac hoc snippets", "ngu bai hoc snippets", "ngu bac ho 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: (((("ngu bac 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: (((("ngu bac hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu bac hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu bac hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.