Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van dinh » van minh, van dich, xuan dinh
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
sach ly » sach y, sach lo, sach ty
van cam » van nam, van lam, van cau
va dinh » va kinh, va tinh, vu dinh
ly nang » ky nang, ly hang, ly vang
hai cau » hai chau, hai chu, hai hau
so sach » so sanh, bo sach, co sach
ma hoi » xa hoi, ma hoa, me hoi

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: so sach ly nang ((ma hoi) OR (mai hoi)). hieu van cam thuc ((va dinh) OR (van dinh)) hai cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ((ma hoi) or (mai hoi)). hieu van cam thuc ((va dinh) OR (van dinh)) hai cau treo~".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ((ma hoi) or (mai hoi)). hieu van cam thuc ((va dinh) OR (van dinh)) hai cau treo*.