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

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) OR (toc sach)) 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: ((toc sac) OR (toc sach)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc sach)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc sach)) ky dang xa hoi. hieu van hau thuc ban thanh ((tai cua) or (tri cua)) te*.