Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
nam thuc » nam thuoc, am thuc, nam thu
so sanh » do sanh
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sanh y » sinh y, anh y, hanh y
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y ((nang xa) or (lang xa)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang xa) OR (lang xa)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang xa) or (lang xa)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang xa) or (lang xa)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (ca viet))*.