Perhaps you should try some spelling variations:
hanh di » hanh vi, hanh de, hang di
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
de cai » de tai, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((de cai) or (ve cac)) ky dang xa hoi. hieu va tham ((soc va) OR (loc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((de cai) OR (ve cac)) ky dang xa hoi. hieu va tham ((soc va) OR (loc va)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((de cai) or (ve cac)) ky dang xa hoi. hieu va tham ((soc va) OR (loc va)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((de cai) or (ve cac)) ky dang xa hoi. hieu va tham ((soc va) OR (loc va)) hanh di cua tre*.