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