Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
duc van » duc va, duc tan, duc manh
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
tu hong » thu hong, tu phong, tu dong
hong ky » thong ke
lang xa » lang ha, dang xay
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: tu hong ky ((lang xa) or (lang van)) hoi. hieu ((ve cham) or (ve chat)) duc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hong ky ((lang xa) OR (lang van)) hoi. hieu ((ve cham) OR (ve chat)) duc van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu hong ky ((lang xa) or (lang van)) hoi. hieu ((ve cham) or (ve chat)) duc van hanh vi cua viet*.