Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hat chau » ha chau, lai chau, hat nhan
cam thuc » am thuc, nam thuc, cam thu
hai cau » hai chau, hai chu, hai hau
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
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
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 ma) or (sang ma)) hoi. hieu van cam thuc va danh ((hai cau) or (hat chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang ma) OR (sang ma)) hoi. hieu van cam thuc va danh ((hai cau) OR (hat chau)) treo.
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang ma) or (sang ma)) hoi. hieu van cam thuc va danh ((hai cau) or (hat chau)) treo*.