Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khap su hoc snippets" » "phap su hoc snippets", "thap su hoc snippets", "khat sua hoc snippets", "khap tu hoc snippets", "khap du hoc snippets", "khap so 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: (((("khap su 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: (((("khap su hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khap su hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khap su hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.