Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
ma hoi » mai hoi, xa hoi, me hoi
du ban » dua ban, duc ban, du bao
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: te sach ky tang ((ma hoi) or (ma hoa)). hieu va cac du ban thanh dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ((ma hoi) OR (ma hoa)). hieu va cac du ban thanh dai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ((ma hoi) or (ma hoa)). hieu va cac du ban thanh dai ((cua tre) OR (cua te))*".