Perhaps you should try some spelling variations:
"toc canh tranh cong khi đong luc" » "toc canh thanh cong khi đong luc", "toc canh trinh cong khi đong luc", "toc canh tran cong khi đong luc", "luoc canh tranh cong khi đong luc", "ngoc canh tranh cong khi đong luc", "luc canh tranh cong khi đong luc", "toc canh tranh cong thai đong luc", "toc canh tranh khong khi đong luc", "toc canh tranh cong ha đong luc"
"te sach nang co khi đong luc" » "te cach mang co khi đong luc", "te sach dung co khi đong luc", "te sach danh co khi đong luc", "toc sach nang co khi đong luc", "te sach nang cao khi đong luc", "te sach nang doc khi đong luc", "te sach nang noi khi đong luc"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("toc canh tranh cong khi đong luc") or ("te sach nang co khi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("toc canh tranh cong khi đong luc") OR ("te sach nang co khi đong luc")).
• Removing quotes may allow a broader search: (( toc canh tranh cong khi đong luc ) or ( te sach nang co khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("toc canh tranh cong khi đong luc") or ("te sach nang co khi đong luc"))*.