Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cau » va cau, ve cau, di cau

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

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