Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tho viet con snippets" » "thon viet con snippets", "thong viet con snippets", "hoc viet con snippets", "tho viet co snippets", "tho diet con snippets", "tho giet con 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: (((("tho viet 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: (((("tho viet con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tho viet con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tho viet con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.