Perhaps you should try some spelling variations:
van sinh » van minh, va sinh, van dinh
sinh dai » sinh thai, si dai, sinh vat
duc van » duc va, duc tan, duc manh
tu ban » thu ban, te ban
ban ky » van ky, dan ky
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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: tu ban ky nang x ho. hieu ((va cam) OR (ve cac)) duc van sinh dai ((cua te) OR (cua tu))~.
• Adding a wildcard symbol may retrieve word variants: tu ban ky nang x ho. hieu ((va cam) or (ve cac)) duc van sinh dai ((cua te) or (cua tu))*.