Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc ma » hoc ma, duoc ma
ma hanh » va hanh, da hanh, na hanh
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
ca viet » va viet, co viet, hoa viet
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) lang xa hoi. hieu va nam thuoc ma hanh vi ((cua vat) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) lang xa hoi. hieu va nam thuoc ma hanh vi ((cua vat) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) lang xa hoi. hieu va nam thuoc ma hanh vi ((cua vat) or (ca viet))*.