Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va
xay hoi » xa hoi, tay hoi, cay phoi
va dang » van dang, va nang, va lang
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va dang xay hoi. ((hieu ve) OR (hieu van)) cau truc ((van hanh) OR (van thanh)) di cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach va dang xay hoi. ((hieu ve) OR (hieu van)) cau truc ((van hanh) or (van thanh)) di cua tu~".
• Adding a wildcard symbol may retrieve word variants: su sach va dang xay hoi. ((hieu ve) OR (hieu van)) cau truc ((van hanh) or (van thanh)) di cua tu*.