Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vien cac » vien bach, vien dai, vien da
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
so sanh » do sanh
lang xa » lang ha, dang xay, lang van
sanh y » sinh y, anh y, hanh y
ve cac » va cac

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 ((ve cac) OR (vien cac)) tuc van hanh dai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang x) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh dai cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang x) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh dai cua viet*.