Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
cuc ban » cua ban, cac ban, cuu ban
lam cuc » lam cua, lam duoc, pham cuc
van lam » van nam
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, mang may
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ((((nang ma) or (sang ma))) or (nang cao)) hoi. hieu van lam cuc ban thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang ma) OR (sang ma))) OR (nang cao)) hoi. hieu van lam cuc ban thanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang ma) or (sang ma))) or (nang cao)) hoi. hieu van lam cuc ban thanh vi cuu tre*.