Perhaps you should try some spelling variations:
ky dang » ky danh
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc may » truc may, phuc may
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua

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

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