Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hang hai » hoang hai, hang tai, thanh hai
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
cao hoi » co hoi, cao hoc, tao hoi
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hai cau » hai chau, hai chu, hai hau
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (ky nang)) ((cao hoi) OR (cau hoi)). lieu va nam thuc va hang hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) ((cao hoi) OR (cau hoi)). lieu va nam thuc va hang hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ky nang)) ((cao hoi) OR (cau hoi)). lieu va nam thuc va hang hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ky nang)) ((cao hoi) OR (cau hoi)). lieu va nam thuc va hang hai cau treo*.