Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
ve chat » van chat
sach ty » sach tu, sach thu, xach tay
va chat » van chat, va phat, cao chat
hang ca » hang va, nang cao, hang tai
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, cua hoi, xa hoi
loc va » hoc va, luc va
vi cua » vai cua, di cua

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: tu ((sach ty) OR (sach y)) hang ca hoi. hieu ((va chat) OR (ve chat)) loc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) hang ca hoi. hieu ((va chat) or (ve chat)) loc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) hang ca hoi. hieu ((va chat) or (ve chat)) loc va hanh vi cua tre*.