Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dang xay » dang van, van xay
sinh dai » sinh thai, si dai, sinh vat
kinh dai » kinh dao, kinh hai, trinh dai
thuc va » thuc vat, thuc dan, thuc day
mang xa » lang xa, mang may, mang cua
xac ky » cac ky, sac ky, bac ky
su xac » pu xac, su cac
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky ((mang xa) or (dang xay)) hoi. lieu va am thuc va ((kinh dai) OR (sinh dai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((mang xa) OR (dang xay)) hoi. lieu va am thuc va ((kinh dai) OR (sinh dai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((mang xa) or (dang xay)) hoi. lieu va am thuc va ((kinh dai) OR (sinh dai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((mang xa) or (dang xay)) hoi. lieu va am thuc va ((kinh dai) OR (sinh dai)) cua viet*.