Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, va thuoc
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
nam tu » nam thu, nam thuc
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: vu sach ky sang ma hoi. hieu ve ((nam tu) or (((nam thuoc) or (cay thuoc)))) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky sang ma hoi. hieu ve ((nam tu) OR (((nam thuoc) OR (cay thuoc)))) van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky sang ma hoi. hieu ve ((nam tu) or (((nam thuoc) or (cay thuoc)))) van hanh vi cua viet*.