Perhaps you should try some spelling variations:
thien van » thi van
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
dua ban » dia ban, cua ban, qua ban
lam dua » lam cua, lam duoc, lam dung
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) _ lang ha hoi. ((hieu va) or (thien van)) lam dua ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) _ lang ha hoi. ((hieu va) OR (thien van)) lam dua ban thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) _ lang ha hoi. ((hieu va) or (thien van)) lam dua ban thanh tai cua tre*".