Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh hai » thanh hai, nhanh hai, hang hai
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
cuc ban » cua ban, cac ban, cuu ban
hai cua » thai cua, dai cua, hoi cua
van cam » van nam, van lam, van cau
xuc ban » duc ban, quoc ban, xuat ban
ky dang » ky danh
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: hoc sach ((ky dang) or (ky nang)) cay phoi. hieu van cam ((xuc ban) OR (cuc ban)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky dang) OR (ky nang)) cay phoi. hieu van cam ((xuc ban) OR (cuc ban)) hanh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky dang) or (ky nang)) cay phoi. hieu van cam ((xuc ban) OR (cuc ban)) hanh hai cua tre*".