Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dinh vien o2 snippets" » "sinh vien o2 snippets", "dinh viet o2 snippets", "dinh dien o2 snippets", "dinh vien moi snippets", "dinh vien mot snippets", "dinh vien mon 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: (((("dinh vien o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dinh vien o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dinh vien o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dinh vien o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.