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