Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
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: te sac ky nang x hoi. hieu ((ve cau) OR (ve cac)) luc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang x hoi. hieu ((ve cau) OR (ve cac)) luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ((ve cau) OR (ve cac)) luc va hanh vi cua tre*.