Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"minh vien o2 snippets" » "sinh vien o2 snippets", "minh hien o2 snippets", "minh tien o2 snippets", "minh vien moi snippets", "minh vien mot snippets", "minh 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: (((("minh 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: (((("minh vien o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( minh vien o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("minh vien o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.