Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"bach viet du snippets" » "bac viet du snippets", "anh viet du snippets", "danh viet du snippets", "bach viet duc snippets", "bach viet duy snippets", "bach viet tu 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: (((("bach viet du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("bach viet du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( bach viet du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("bach viet du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.