Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cau » hai chau, hai hau, hoi cau
hai chu » hai chau, hoi chu, hai chi
y nang » ky nang, ly nang, v nang

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 y nang cao hoi. hieu van nam thuc va hanh ((hai cau) OR (hai chu)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang cao hoi. hieu van nam thuc va hanh ((hai cau) OR (hai chu)) treo".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. hieu van nam thuc va hanh ((hai cau) OR (hai chu)) treo*.