Perhaps you should try some spelling variations:
hoc sachh » doc sach, hoc cach, toc sach
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
hau thuc » huu thuc, ha thuc, mau thuc
thuc ban » thuoc ban, thuc dan, thu ban
hieu van » hieu va, thien van, lieu va
van hau » van ha, van hai, van dau
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tai cua » thai cua, tai cuc, dai cua

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) or (hoc sachh)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sachh)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) OR (tri cua)) te.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc sachh)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) or (tri cua)) te*.