Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dat
co sach » bo sach, cuon sach, hoc sach
chuc va » thuc va, thuc vat
phuc va » phuc vu, thuc va, thuc vat
hieu ve » hieu va, hieu van
tai hoa » tai khoa, thai hoa, thi hoa
cua tre » cua te, cuu tre, cua triet
sach m » sach y, sach 2, sach kem
ve cau » ke cau, va cau, ve cac
m dung » _ dung, kim dung, mai dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach m dung tai hoa. hieu ve cau ((phuc va) or (chuc va)) ((hanh dai) or (vanh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach m dung tai hoa. hieu ve cau ((phuc va) OR (chuc va)) ((hanh dai) OR (vanh dai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: co sach m dung tai hoa. hieu ve cau ((phuc va) or (chuc va)) ((hanh dai) or (vanh dai)) cua tre*.