Perhaps you should try some spelling variations:
"python using java slippery" » "python using data slippery"
"thi van viet slippers" » "thi san viet slippers", "thi gian viet slippers", "thi tran viet slippers", "thi lan viet slippers", "thi hanh viet slippers", "thi nang viet slippers", "thi van viet grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("thi van viet slippers") or ("python using java slippery"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi van viet slippers") OR ("python using java slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi van viet slippers ) or ( python using java slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi van viet slippers") or ("python using java slippery"))) or ("locating bug code snippets"))*.