Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
sach tranh » canh tranh
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
co sach » bo sach, cuon sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( do sanh ngo dac khi đong luc ) or ( co sach tranh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( do sanh ngo dac khi đong luc ) OR ( co sach tranh cong khi đong luc ))*.