Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam duoc » nam thuoc, da duoc, dat duoc
su sach » so sach, vu sach
san cua » sang cua, ban cua, dan cua
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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 ty tang ((ma hoi) OR (mai hoi)). hieu ve ((nam duoc) or (cam xuc)) ban thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty tang ((ma hoi) OR (mai hoi)). hieu ve ((nam duoc) OR (cam xuc)) ban thanh san cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty tang ((ma hoi) OR (mai hoi)). hieu ve ((nam duoc) or (cam xuc)) ban thanh san cua tre*".