Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
cac tuc » cac toc, cac tu, cac tac
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
sanh y » sinh y, anh y, hanh y

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang x) OR (lang xa)) hoi. hieu van cac tuc van hanh di ((cua viet) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang x) or (lang xa)) hoi. hieu van cac tuc van hanh di ((cua viet) OR (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang x) or (lang xa)) hoi. hieu van cac tuc van hanh di ((cua viet) OR (hoa viet))*.