Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, cau treo
vat hang » van hang, dat hang, va hang
cam thuc » am thuc, nam thuc, cam thu
hang di » hang doi, hang vi, hang dien
van cam » van nam, van lam, van cau
te sach » toc sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
so sanh » do sanh
ca tren » cu tren, la tren, co tren
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (so sanh)) ky tang ma hoi. hieu van cam thuc vat hang di ((cau tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ky tang ma hoi. hieu van cam thuc vat hang di ((cau tren) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky tang ma hoi. hieu van cam thuc vat hang di ((cau tren) or (ca tren))*.