Perhaps you should try some spelling variations:
nuoc san » nuoc luan, nguoi san, nuoc quan
cau thuc » cau truc, cuu thuc, can thuc
hoang vi » hoang va, hoang vu, hoang viet
dang xay » dang van, van xay
thuc van » thuc vat, thuc dan, thuc va
hang vi » hang va, hanh vi, hang di
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
san ky » sang ky, van ky, dan ky
ve cau » ke cau, va cau, ve cac

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 (dang xay)) hoi. hieu ve cau thuc van ((hoang vi) OR (hang vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc san ky ((nang xa) OR (dang xay)) hoi. hieu ve cau thuc van ((hoang vi) OR (hang vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc san ky ((nang xa) or (dang xay)) hoi. hieu ve cau thuc van ((hoang vi) OR (hang vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc san ky ((nang xa) or (dang xay)) hoi. hieu ve cau thuc van ((hoang vi) OR (hang vi)) cua tre*.