Perhaps you should try some spelling variations:
thanh soc » thanh son, nhanh soc, thanh hoc
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach
soc van » hoc van, oc van, sac van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
vu sach » vu bach, vu khach
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) or (vu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu va thanh soc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu va thanh soc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu va thanh soc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu va thanh soc van hanh vi cua tre*.