Perhaps you should try some spelling variations:
san hanh » san thanh, ban hanh, van hanh
cua tre » cua te, cuu tre, cua triet
cuu san » cuu van, cua san, cuu ban
ve cham » va cham, ve chat, vu cham
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky lang ((van hoi) or (van hoc)). hieu ((ve cham) or (va cac)) cuu san hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang ((van hoi) OR (van hoc)). hieu ((ve cham) OR (va cac)) cuu san hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ((van hoi) or (van hoc)). hieu ((ve cham) or (va cac)) cuu san hanh vi cua tre*.