Perhaps you should try some spelling variations:
"su sach tranh dung chi đong luc" » "su canh tranh dung chi đong luc", "su sach trinh dung chi đong luc", "su sach tran dung chi đong luc", "su sach thanh dung chi đong luc", "su sach tranh dung cho đong luc", "su sach tranh dung thi đong luc", "su sach tranh dung chien đong luc", "so sach tranh dung chi đong luc", "vu sach tranh dung chi đong luc"
"su can tranh co khi đong luc" » "su canh tranh co khi đong luc", "su tan tran co khi đong luc", "su van ranh co khi đong luc", "su can trinh co khi đong luc", "su can tranh o khi đong luc", "su can tranh cuoc khi đong luc", "su van tranh co khi đong luc", "su cao tranh co khi đong luc", "tu can tranh co khi đong luc"

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: (("su can tranh co khi đong luc") or ("su sach tranh dung chi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su can tranh co khi đong luc") OR ("su sach tranh dung chi đong luc")).
• Removing quotes may allow a broader search: (( su can tranh co khi đong luc ) or ( su sach tranh dung chi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("su can tranh co khi đong luc") or ("su sach tranh dung chi đong luc"))*.