Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban banh » ban hanh, ban danh, ban thanh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam cuc » cam xuc, cham cuu, pham cuc
ban anh » ban hanh, ban danh, bang anh
cua tre » cua te, cuu tre, cua triet

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 ky ((nang xa) or (nang cao)) hoi. hieu van cam cuc ((ban banh) OR (ban anh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang cao)) hoi. hieu van cam cuc ((ban banh) OR (ban anh)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (nang cao)) hoi. hieu van cam cuc ((ban banh) OR (ban anh)) dai cua tre*".