Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va trien » va truyen, va thiet, va tuyen
dang xay » dang van, van xay
va thanh » gia thanh, va tinh, le thanh
toc sach » hoc sach, doc sach, thuoc sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cac tuc » cac toc, cac tu, cac tac
ket va » ket van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky dang xay hoi. lieu va cac tuc ((va thanh) OR (ban thanh)) ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xay hoi. lieu va cac tuc ((va thanh) OR (ban thanh)) ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang xay hoi. lieu va cac tuc ((va thanh) OR (ban thanh)) ket va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang xay hoi. lieu va cac tuc ((va thanh) OR (ban thanh)) ket va trien*.