Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
van chat » cao chat
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, thi hang, thu hang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc 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: su sach ((ty hang) OR (ty xang)) mai hoi. hieu ((va thuat) OR (van chat)) luc va thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ty xang)) mai hoi. hieu ((va thuat) or (van chat)) luc va thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ty xang)) mai hoi. hieu ((va thuat) or (van chat)) luc va thanh vi cua tre*.