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