Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khat ha hoc snippets" » "kham pha hoc snippets", "chat hoa hoc snippets", "khac hau hoc snippets", "khat hoa hoc snippets", "khat nha hoc snippets", "khat va 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: (((("khat ha 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: (((("khat ha hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khat ha hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khat ha hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.