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

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