Perhaps you should try some spelling variations:
ky dang » ky danh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
cua tre » cuu tre, cua triet, dua tren
vu ban » tu ban, va ban
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dau
dan du » dan dau, danh du, dan su
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu ban ((ky dang) or (ky nang)) xa hoi. hieu ve cac duc va dan du ((cua te) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ban ((ky dang) OR (ky nang)) xa hoi. hieu ve cac duc va dan du ((cua te) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: vu ban ((ky dang) or (ky nang)) xa hoi. hieu ve cac duc va dan du ((cua te) or (cua tre))*.