Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
va giao » van giao, va giai, va gia
cua tre » cuu tre, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
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: tu sach tu ((tang ma) or (lang xa)) hoi. hieu va giao duc ban thanh tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((tang ma) OR (lang xa)) hoi. hieu va giao duc ban thanh tai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((tang ma) or (lang xa)) hoi. hieu va giao duc ban thanh tai ((cua tre) or (cua te))*.