Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau trieu
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao

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 ((tu nano) OR (truc nano)) xa hoi. hieu va cam xuc van hanh vi ((cau treo) OR (cau triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nano) or (truc nano)) xa hoi. hieu va cam xuc van hanh vi ((cau treo) OR (cau triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nano) or (truc nano)) xa hoi. hieu va cam xuc van hanh vi ((cau treo) OR (cau triet))*.