Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tri lieu doi snippets" » "tai lieu doi snippets", "thi lien doi snippets", "tri lieu boi snippets", "tri lieu voi snippets", "tri lieu dai 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: (((("tri lieu doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tri lieu doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tri lieu doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tri lieu doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.