Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
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: su sach y ((nang x) or (lang xa)) hoi. ((hieu ve) or (hieu va)) nam thuoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) nam thuoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (lang xa)) hoi. ((hieu ve) or (hieu va)) nam thuoc va hanh vi cua tre*.