Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
hanh lai » hanh lam, hanh tai, thanh lap
thuc van » thuc vat, thuc dan, thuc va
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
cua tre » cua te, cuu tre, cua triet

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 dang xay hoi. ((hieu ve) or (hieu va)) cam ((thuc van) or (duc van)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty dang xay hoi. ((hieu ve) OR (hieu va)) cam ((thuc van) OR (duc van)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty dang xay hoi. ((hieu ve) or (hieu va)) cam ((thuc van) or (duc van)) hanh lai cua tre*.