Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, hieu van
cac chat » cao chat, cac thuat, cac nha
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
luc va » tuc va, loc va

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

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