Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, sach danh
sach tranh » canh tranh
nganh my » nganh y, nganh ma, nganh ky
tranh my » trinh my, tran sy, anh my
bo sach » co sach, hoc sach
so sach » so sanh, co sach, hoc sach
my khi » ly khi, ky khi
my chi » ly chi, y chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( bo sach nganh my khi đong luc ) or ( so sach tranh my chi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo sach nganh my khi đong luc ) OR ( so sach tranh my chi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( bo sach nganh my khi đong luc ) or ( so sach tranh my chi đong luc ))*.