Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu dan » hieu van, sieu dan, hieu dac
cuu tre » cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoa » mai khoa, ma hoa, dai hoa
mat hoa » ma hoa, chat hoa, nhat hoa
ky dung » ly dung, ky dang, ky vung
cua tre » cua te, cua triet, dua tren
ca dua » cay dua, ca cua, ca da

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 ky dung ((mat hoa) OR (mai hoa)). hieu dan ca dua ban thanh vai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dung ((mat hoa) OR (mai hoa)). hieu dan ca dua ban thanh vai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dung ((mat hoa) OR (mai hoa)). hieu dan ca dua ban thanh vai ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dung ((mat hoa) OR (mai hoa)). hieu dan ca dua ban thanh vai ((cuu tre) or (cua tre))*.