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