Perhaps you should try some spelling variations:
thanh tap » thanh lap, thanh tai, thanh tay
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang ma » mang may, tang van
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
tap cua » tap quan, tiep cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
soc va » hoc va, loc va, doc va

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. ((hieu vu) or (hieu va)) cham soc va thanh tap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty tang ma hoi. ((hieu vu) OR (hieu va)) cham soc va thanh tap cua tre*.