Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
sanh ngon » danh ngon, canh ngon, sach ngon
ngon doc » ngo duc, ngo dac
cong khi » cong thai, khong khi, co khi
doc khi » doi khi, hoc khi, hoc khoi
co sach » cuon sach, hoc sach
bo 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 ngon doc khi đong luc ) or ( ((co sach) OR (bo sach)) tranh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( do sanh ngon doc khi đong luc ) OR ( ((co sach) OR (bo sach)) tranh cong khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( do sanh ngon doc khi đong luc ) or ( ((co sach) OR (bo sach)) tranh cong khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( do sanh ngon doc khi đong luc ) or ( ((co sach) OR (bo sach)) tranh cong khi đong luc ))*.