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