Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc voi con snippets" » "quoc hoi con snippets", "quoc oai con snippets", "quoc va con snippets", "quoc voi cong snippets", "quoc voi chon snippets", "quoc 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: (((("quoc 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: (((("quoc voi con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc voi con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc voi con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.