Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
cuon sach » duong sach, cuoc cach, co sach
sanh ngo » danh ngon, canh ngon, sach ngon
cong khi » cong thai, khong khi, co khi
ngo dac » ngo duc, ngo doan, ngoc duc
dac khi » dau khi, cac khi, cac khoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( do sanh ngo dac khi đong luc ) OR ( cuon sach tranh cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( do sanh ngo dac khi đong luc ) or ( cuon sach tranh cong khi đong luc ))*.