Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
te sach » toc sach
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
me hoi » le hoi

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 ky nang ((me hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc ban thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((me hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cac duc ban thanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((me hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc ban thanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((me hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc ban thanh hoi cua tre*.