Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
danh dai » danh dau, danh di, danh sai
hau tren » dau tren, cau tren, thai tren
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dai hau » dai han, dai hai, dai huu
ma hoi » mai hoi, ma hoa, me hoi

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 lo nang ((ma hoi) or (xa hoi)). hieu van cam thuc va danh dai hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo nang ((ma hoi) OR (xa hoi)). hieu van cam thuc va danh dai hau tren.
• Adding a wildcard symbol may retrieve word variants: su sach lo nang ((ma hoi) or (xa hoi)). hieu van cam thuc va danh dai hau tren*.