Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
danh hai » dang hai, lanh hai, manh hai
vat danh » va danh, van danh, luat danh
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
van cam » van nam, van lam, van cau
su sach » so sach
nang xa » nang x, nang ma, mang xa
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van

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) OR (vu sach)) ly ((nang xa) or (lang xa)) hoi. hieu van cam thuc vat danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly ((nang xa) OR (lang xa)) hoi. hieu van cam thuc vat danh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ly ((nang xa) or (lang xa)) hoi. hieu van cam thuc vat danh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ly ((nang xa) or (lang xa)) hoi. hieu van cam thuc vat danh hai cau treo*.