Perhaps you should try some spelling variations:
van tham » van thanh, van tuan, van chat
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
ky lang » ky nang, ky dang, ky tang
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
te cac » tu cac, ve cac, te cao

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

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