Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cham van son snippets" » "pham van son snippets", "cham va son snippets", "chao van son snippets", "cham van dong snippets", "cham van cong snippets", "cham van sung 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: (((("cham van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cham van son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cham van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cham van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.