Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phat voi can snippets" » "phat vi can snippets", "pham voi can snippets", "pho voi can snippets", "phat voi cac snippets", "phat voi cong snippets", "phat voi hang 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: (((("phat voi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phat voi can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phat voi can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phat voi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.