Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
soc van » hoc van, oc van, sac van
cuu tre » cua tre, cau tren
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
vu cham » va cham, vu kham, qua cham
xay hoi » xa hoi, tay hoi, cay phoi
tu cham » toc cham, thi cham
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 ((vu cham) OR (tu cham)) soc van hanh di ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xay hoi. hieu ((vu cham) OR (tu cham)) soc van hanh di ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xay hoi. hieu ((vu cham) OR (tu cham)) soc van hanh di ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xay hoi. hieu ((vu cham) OR (tu cham)) soc van hanh di ((cuu tre) or (cau treo))*.