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