Perhaps you should try some spelling variations:
"te canh tranh cong khi đong luc" » "te canh thanh cong khi đong luc", "te canh trinh cong khi đong luc", "te canh tran cong khi đong luc", "te canh tranh cong thai đong luc", "te canh tranh khong khi đong luc", "te canh tranh co khi đong luc", "ve canh tranh cong khi đong luc", "te danh tranh cong khi đong luc", "re canh tranh cong khi đong luc"
"toc sach tranh cong khi đong luc" » "toc sach thanh cong khi đong luc", "toc sach trinh cong khi đong luc", "toc sach tran cong khi đong luc", "toc sach tranh cong thai đong luc", "toc sach tranh khong khi đong luc", "toc sach tranh co khi đong luc", "hoc sach tranh cong khi đong luc", "doc sach tranh cong khi đong luc", "thuoc sach tranh cong 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: (("te canh tranh cong khi đong luc") or ("toc sach tranh cong khi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te canh tranh cong khi đong luc") OR ("toc sach tranh cong khi đong luc")).
• Removing quotes may allow a broader search: (( te canh tranh cong khi đong luc ) or ( toc sach tranh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("te canh tranh cong khi đong luc") or ("toc sach tranh cong khi đong luc"))*.