Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
sach hoi » sach doi, sach moi, cach thoi
qua nhat » qua hoat, luc nhat, qua hai
nhat dua » nhat cua, nhat qua, hat dua
sach lo » sach dao, sach doi, sach moi
lang xa » lang ha, dang xay, lang van
dua ban » dia ban, cua ban, qua ban
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 lo) OR (sach hoi))) or (sac o)) lang xa hoi. hieu qua nhat dua ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach lo) OR (sach hoi))) OR (sac o)) lang xa hoi. hieu qua nhat dua ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((((sach lo) OR (sach hoi))) or (sac o)) lang xa hoi. hieu qua nhat dua ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((((sach lo) OR (sach hoi))) or (sac o)) lang xa hoi. hieu qua nhat dua ban thanh dai cua tre*.