Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cuu thuc » cuu tac
hai chau » lai chau, ha chau, hat chau
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cuu » van cau, van chu, van cu
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chu, hai hau, hoi cau
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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