Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
pham cuc » pham chuc, pham duc, pham cua
hieu va » lieu va, hieu qua
danh va » doanh va, hanh va, anh va
cuc ban » cua ban, cac ban, cuu ban
va pham » van pham, va phat, va phap
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 ((lang xa) or (nang ma)) hoi. hieu va pham cuc ban danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (nang ma)) hoi. hieu va pham cuc ban danh va cua tre*.