Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hoc sac » hoc sach, hoc cac, hoc mac
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
hieu ve » hieu van
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky dang ma hoi. ((hieu ve) OR (hieu va)) cam ((duc va) OR (loc va)) thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky dang ma hoi. ((hieu ve) OR (hieu va)) cam ((duc va) or (loc va)) thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky dang ma hoi. ((hieu ve) OR (hieu va)) cam ((duc va) or (loc va)) thanh vai cua tre*.