Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dua khen cac snippets" » "dua tren cac snippets", "dua khen ca snippets", "dua khien cau snippets", "dua thien cac 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: (((("dua khen cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dua khen cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dua khen cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dua khen cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.