Perhaps you should try some spelling variations:
nuoc san » nuoc luan, nguoi san, nuoc quan
cau treo » cau theo, cau triet, cau trieu
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
cau tren » cu tren, dau tren, ca tren
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cau » ke cau, va cau, ve cac
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc san ky ((nang xa) OR (nang x)) hoi. hieu ve cau thuc van hanh de ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc san ky ((nang xa) OR (nang x)) hoi. hieu ve cau thuc van hanh de ((cau treo) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc san ky ((nang xa) OR (nang x)) hoi. hieu ve cau thuc van hanh de ((cau treo) or (cau tren))*".