Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh hoai
thanh do » thanh de, thanh pho, thanh hoa
hoc dua » hoc cua, hoc duc, hoc lua
dua van » duy van, dua vao, duc van
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
xang x » nang x
va hoc » van hoc
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ty) or (sach y)) xang x hoi. hieu va hoc dua van ((thanh do) or (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach y)) xang x hoi. hieu va hoc dua van ((thanh do) OR (thanh doi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sach y)) xang x hoi. hieu va hoc dua van ((thanh do) or (thanh doi)) cua tre*.