Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu ban chat snippets" » "thu van chat snippets", "thu bao chat snippets", "thu luan chat snippets", "thu hang chat 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: (((("thu ban chat snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu ban chat snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu ban chat snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu ban chat snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.