Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hai thuc » thai thuc, dai thuc, ha thuc
thuc ban » thuoc ban, thuc dan, thu ban
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van hai » van ha, van chat, van hanh
tai cua » thai cua, tai cuc, hai cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. hieu van hai thuc ban thanh ((((tai cua) OR (dai cua))) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu van hai thuc ban thanh ((((tai cua) OR (dai cua))) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu van hai thuc ban thanh ((((tai cua) OR (dai cua))) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu van hai thuc ban thanh ((((tai cua) OR (dai cua))) or (tri cua)) te*.