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