Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu len cong snippets" » "thu den cong snippets", "thu le cong snippets", "thu len con snippets", "thu les cong snippets", "thu hien cong snippets", "thu dien cong 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 len cong 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 len cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu len cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu len cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.