Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
nganh xay » nganh mac, nganh y, nganh ma
nganh my » nganh y, nganh ma, nganh mac
nganh ky » nganh y, hanh ky, nganh co
bo sach » co sach, hoc sach
tu cach » tu cac
my khi » ly khi, ky khi, my 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 ( tu cach ((nganh ky) OR (nganh xay)) khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo sach nganh my khi đong luc ) OR ( tu cach ((nganh ky) OR (nganh xay)) khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( bo sach nganh my khi đong luc ) or ( tu cach ((nganh ky) OR (nganh xay)) khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( bo sach nganh my khi đong luc ) or ( tu cach ((nganh ky) OR (nganh xay)) khi đong luc ))*.