Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va cham » va tham
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, me hoi
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 y hang ((ma hoi) OR (ma hoa)). hieu ((va cham) or (va chat)) luc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang ((ma hoi) OR (ma hoa)). hieu ((va cham) OR (va chat)) luc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y hang ((ma hoi) OR (ma hoa)). hieu ((va cham) or (va chat)) luc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y hang ((ma hoi) OR (ma hoa)). hieu ((va cham) or (va chat)) luc va thanh vi cua tre*.