Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
hai chau » lai chau, ha chau, hat chau
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chu, hai hau, hoi cau

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 ky nang xa hoi. ((hieu van) or (lieu va)) am thuc va danh ((hai cau) OR (hai chau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu van) OR (lieu va)) am thuc va danh ((hai cau) OR (hai chau)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu van) or (lieu va)) am thuc va danh ((hai cau) OR (hai chau)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu van) or (lieu va)) am thuc va danh ((hai cau) OR (hai chau)) triet*.