Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tac van cong snippets" » "tac van dong snippets", "tac van phong snippets", "tac phan cong snippets", "tac vang cong snippets", "cac van cong snippets", "tac va 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: (((("tac van 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: (((("tac van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tac van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tac van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.