Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tra khao cac snippets" » "tra kha cac snippets", "tham khao cac snippets", "va khao cac snippets", "tra khai cac snippets", "tra cho cac snippets", "tra khao sat 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: (((("tra khao 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: (((("tra khao cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra khao cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra khao cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.