Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cau treo » cau theo, cau tren, cau triet
van danh » van doanh, van anh, van hanh
vat danh » va danh, luat danh, nhat danh
va cham » va chat, va tham
hai cau » hai chau, hai chu, hai hau
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hieu va » lieu va, hieu qua
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly hang ((ma hoi) or (xa hoi)). hieu va cham thuc ((vat danh) or (van danh)) hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly hang ((ma hoi) OR (xa hoi)). hieu va cham thuc ((vat danh) OR (van danh)) hai cau treo.
• Adding a wildcard symbol may retrieve word variants: so sach ly hang ((ma hoi) or (xa hoi)). hieu va cham thuc ((vat danh) or (van danh)) hai cau treo*.