Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
so cach » so sach, loi cach, mot cach
co cach » co cac, co sach, ca cach
tu tong » tu tuong, tu trong, tu dong
tong ma » tang ma, dong ma, cong ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
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: ((so cach) or (co cach)) tu tong ma hoi. hieu ve ((nam thu) or (cay thuoc)) va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so cach) OR (co cach)) tu tong ma hoi. hieu ve ((nam thu) OR (cay thuoc)) va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((so cach) or (co cach)) tu tong ma hoi. hieu ve ((nam thu) or (cay thuoc)) va hanh vi cua vat*.