Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, va thuoc
nam thuoc » nam thu, nha thuoc, va thuoc
cua viet » ca viet, hoa viet, cua vat
nam thuc » am thuc, nam thu, nam tu
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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 ky sang ma hoi. hieu ve ((nam thuc) or (((nam thuoc) or (cay thuoc)))) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky sang ma hoi. hieu ve ((nam thuc) OR (((nam thuoc) OR (cay thuoc)))) van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: bo sach ky sang ma hoi. hieu ve ((nam thuc) or (((nam thuoc) or (cay thuoc)))) van hanh vi cua viet*.