Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tham soc » cham soc, tham nuoc, thai son
cua tre » cua te, cuu tre, cua triet
soc van » hoc van, oc van, sac van
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
ha hoi » ha noi, xa hoi, va hoi
ve cac » va cac, vien cac
vi cua » vai cua, di cua
te cac » tu cac, te cao, de cac

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