Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
danh hai » dang hai, lanh hai, manh hai
cau treo » cau theo, cau tren, cau triet
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau

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