Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
luu van » cuu van, luan van, luu hanh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cau
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ((((ve cam) OR (ve cai))) or (ve cac)) luu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu ((((ve cam) OR (ve cai))) OR (ve cac)) luu van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu ((((ve cam) OR (ve cai))) or (ve cac)) luu van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ((((ve cam) OR (ve cai))) or (ve cac)) luu van hanh vi cua tre*.