Perhaps you should try some spelling variations:
thanh dieu » thanh lieu, than dieu, hanh dieu
ban thanh » ban hanh, ban hang
dieu cua » dieu tra
so sach » so sanh, co sach, hoc sach
vuc ban » vu ban, duc ban, cuc ban
ve chat » va chat, van chat
vu chat » va chat, du chat, vu cham
dong ha » dong hoa, dong va, dong hoc
ty dong » tay dong, tu dong, ly dong
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) ty dong ha hoi. hieu ((vu chat) OR (ve chat)) vuc ban thanh dieu cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ty dong ha hoi. hieu ((vu chat) OR (ve chat)) vuc ban thanh dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ty dong ha hoi. hieu ((vu chat) OR (ve chat)) vuc ban thanh dieu cua tre*.