Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
sach dao » lanh dao
chat dua » chat cua, chat lua, chay dua
dua ban » dia ban, cua ban, qua ban
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
sach lo » sach doi, sach hoi, sach moi

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 dao))) or (sac o)) lang xa hoi. hieu va chat dua ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach lo) OR (sach dao))) OR (sac o)) lang xa hoi. hieu va chat dua ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((((sach lo) OR (sach dao))) or (sac o)) lang xa hoi. hieu va chat dua ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((((sach lo) OR (sach dao))) or (sac o)) lang xa hoi. hieu va chat dua ban thanh dai cua tre*.