Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » nam thuc, cam thu, can thuc
vat danh » va danh, van danh, luat danh
danh hai » dang hai, lanh hai, manh hai
cau treo » cau theo, cau tren, cau triet
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hai cau » hai chau, hai chu, hai hau

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

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