Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"rap hieu cua snippets" » "phap hieu cua snippets", "rat nhieu cua snippets", "cao hieu cua snippets", "rap hieu qua snippets", "rap dieu cua snippets", "rap bieu cua 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: (((("rap hieu cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("rap hieu cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( rap hieu cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("rap hieu cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.