Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
va thanh » gia thanh, ban thanh, va tinh
hoi cua » hoi chuc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach y) or (sach 2)) nang ((x hoi) OR (o hoi)). hieu ve cham soc va thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach y) OR (sach 2)) nang ((x hoi) OR (o hoi)). hieu ve cham soc va thanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach y) or (sach 2)) nang ((x hoi) OR (o hoi)). hieu ve cham soc va thanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sach 2)) nang ((x hoi) OR (o hoi)). hieu ve cham soc va thanh hoi cua tre*.