Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cuon sach » duong sach, cuoc cach, co sach
thuoc va » thuc va, thuoc ma, thuong va
va trien » va truyen, va tuyen, va tieng
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hanh va » hang va, hanh vi
hieu he » hieu ve, hiem he, hieu le
va hanh » van hanh, va thanh, va danh
he nam » ha nam, nghe nam
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: cuon sach y ((nang ma) or (sang ma)) hoi. hieu he nam thuoc va hanh va ((va trien) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuon sach y ((nang ma) OR (sang ma)) hoi. hieu he nam thuoc va hanh va ((va trien) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: cuon sach y ((nang ma) or (sang ma)) hoi. hieu he nam thuoc va hanh va ((va trien) or (va thiet))*.