Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hai cau » hai chau, hai chu, hoi cau
hai hau » hai chau, dai hau, hai hai
y nang » ly nang, v nang, may nang
va nam » van nam, ha nam, va nay

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 ((y nang) OR (ky nang)) cao hoi. lieu va nam thuc va hang ((hai cau) OR (hai hau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ky nang)) cao hoi. lieu va nam thuc va hang ((hai cau) OR (hai hau)) treo~".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ky nang)) cao hoi. lieu va nam thuc va hang ((hai cau) OR (hai hau)) treo*.