Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
cau treo » cau theo, cau tren, cau triet
gia hanh » gia thanh, giao hanh, gia anh
duc gia » quoc gia
cac duc » cac du, cao duc, cac dac
su sach » so sach, vu sach
hieu ve » hieu va
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y dang xay hoi. ((hieu ve) OR (hieu van)) cac duc gia hanh vi ((cau treo) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xay hoi. ((hieu ve) OR (hieu van)) cac duc gia hanh vi ((cau treo) OR (cau thi)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xay hoi. ((hieu ve) OR (hieu van)) cac duc gia hanh vi ((cau treo) or (cau thi))".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xay hoi. ((hieu ve) OR (hieu van)) cac duc gia hanh vi ((cau treo) or (cau thi))*.