Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
tham soc » cham soc, tham nuoc, thai son
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
lua tre » cua tre, luy tre, dua tren
te sac » te sach, te cac, te san
soc va » hoc va, loc va, doc va
vi lua » vi luu

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

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