Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi van long snippets" » "thi van luong snippets", "thi van dong snippets", "thi van cong snippets", "thi lan long snippets", "thi hanh long snippets", "thi nang long 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: (((("thi van long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi van long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi van long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi van long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.