Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
day manh » van manh, duc manh, ha manh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
thi lan » thi hanh, thi nang, thi lien
manh vi » hanh vi, mach vi, manh va
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 ho. ((hieu ve) or (thi lan)) ((nam thuc) or (nam thuoc)) day manh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. ((hieu ve) OR (thi lan)) ((nam thuc) OR (nam thuoc)) day manh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. ((hieu ve) or (thi lan)) ((nam thuc) or (nam thuoc)) day manh vi cua tre*.