Perhaps you should try some spelling variations:
thanh tan » thanh toan, thanh tuan, thanh san
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
tan cua » than cua, tang cua, toan cua
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
hieu ve » hieu van
ly hang » ly quang
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ly hang ((x hoi) or (o hoi)). ((hieu ve) OR (hieu va)) am thuc va thanh tan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly hang ((x hoi) OR (o hoi)). ((hieu ve) OR (hieu va)) am thuc va thanh tan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly hang ((x hoi) or (o hoi)). ((hieu ve) OR (hieu va)) am thuc va thanh tan cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ly hang ((x hoi) or (o hoi)). ((hieu ve) OR (hieu va)) am thuc va thanh tan cua tre*.