Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
sach ly » sach y, sach lo, sach ty
hai chu » hai chau, hoi chu, hai chi
hai cau » hai chau, hai hau, hoi cau
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao

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 ly nang ((ma hoi) or (mai hoi)). hieu va cam thuc va danh ((hai cau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((ma hoi) OR (mai hoi)). hieu va cam thuc va danh ((hai cau) OR (hai chu)) treo.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((ma hoi) or (mai hoi)). hieu va cam thuc va danh ((hai cau) or (hai chu)) treo*.