Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hanh tai » thanh tai, hang tai, han tai
va triet » va trien, ve triet, cua triet
thuoc va » thuc va, thuoc ma, thuong va
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu hien
hieu le » hieu ve, hieu ly, tieu le
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
thiet » thieu

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 ly nang ma hoa. ((hieu he) OR (hieu le)) nam thuoc va hanh tai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoa. ((hieu he) OR (hieu le)) nam thuoc va hanh tai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ma hoa. ((hieu he) OR (hieu le)) nam thuoc va hanh tai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoa. ((hieu he) OR (hieu le)) nam thuoc va hanh tai ((va triet) or (va thiet))*.