Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
so sanh » do sanh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
hanh di » hanh vi, hanh de, hang di
sanh y » sinh y, anh y, hanh y
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua

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 tuc van hanh di cua viet~.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang x) or (lang xa)) hoi. hieu ve cac tuc van hanh di cua viet*.