Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
tang ma » mang may, tang van
cua te » cua tu

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 y ((tang ma) or (dang xay)) hoi. hieu va cac duc ban thanh vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((tang ma) OR (dang xay)) hoi. hieu va cac duc ban thanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((tang ma) or (dang xay)) hoi. hieu va cac duc ban thanh vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((tang ma) or (dang xay)) hoi. hieu va cac duc ban thanh vai ((cua tre) OR (cua te))*.