Perhaps you should try some spelling variations:
hau treo » cau treo, cau theo, dau tren
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
cam thuc » am thuc, nam thuc, cam thu
nang ma » tang ma, sang ma, nang cao
sach ly » sach y, sach lo, sach ty
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, mang xa
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai hau » hai chau, dai hau, hai hai
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((nang xa) or (nang ma)) hoi. hieu van cam thuc va danh hai hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang xa) OR (nang ma)) hoi. hieu van cam thuc va danh hai hau treo.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang xa) or (nang ma)) hoi. hieu van cam thuc va danh hai hau treo*.