Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
sach tranh » canh tranh
cao khai » cao chat, co khi, cao tai
co nganh » hoc nganh, cac nganh, moi nganh
cong khi » cong thai, khong khi, co khi
so sach » so sanh, bo sach, co sach
cho khi » co khi, cho ghi, chat khi

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: (( so sach tranh ((cho khi) OR (cao khai)) đong luc ) OR ( su co nganh cong khi đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach tranh ((cho khi) OR (cao khai)) đong luc ) or ( su co nganh cong khi đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( so sach tranh ((cho khi) OR (cao khai)) đong luc ) or ( su co nganh cong khi đong luc ))*.