Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
va danh » va dinh, va dan, va hanh
hai hau » dai hau, hai hai, lai chau
hai cau » hai chu, hoi cau, hang cau
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
thuc va » thuc vat, thuc dan, thuc day
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 ly nang ma hoi. hieu van cam thuc va danh ((((hai cau) OR (hai hau))) or (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu van cam thuc va danh ((((hai cau) OR (hai hau))) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ma hoi. hieu van cam thuc va danh ((((hai cau) OR (hai hau))) or (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu van cam thuc va danh ((((hai cau) OR (hai hau))) or (hai chau)) treo*.