Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong van duy slippers" » "duong van duy slippers", "dang van duy slippers", "dong von duy slippers", "dong van dung slippers", "dong van duy slippery", "dong van duy grippers"
"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: (((("dong van duy slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong van duy slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong van duy slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong van duy slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.