Perhaps you should try some spelling variations:
thanh tap » thanh lap, thanh tai, thanh tay
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
tap cua » tap quan, tiep cua
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
sach ty » sach y, sach tu, sach thu
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 vu) or (hieu va)) cham duc va thanh tap 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 vu) OR (hieu va)) cham duc va thanh tap 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 vu) or (hieu va)) cham duc va thanh tap cua tre*".