Perhaps you should try some spelling variations:
tham soc » cham soc, tham nuoc, thai son
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, va hoi
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua

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 lang) OR (ky dang)) ((ha hoi) or (xa hoi)). hieu va tham soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky lang) OR (ky dang)) ((ha hoi) OR (xa hoi)). hieu va tham soc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky lang) OR (ky dang)) ((ha hoi) or (xa hoi)). hieu va tham soc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky lang) OR (ky dang)) ((ha hoi) or (xa hoi)). hieu va tham soc va hanh vi cua tre*.