Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vi cua » vai cua, di cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve bao » te bao, va bao
ve bac » ve cac, ve ban, he bac
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: su sac ky nang x hoi. hieu ((ve bac) OR (ve bao)) bo ((va hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu ((ve bac) OR (ve bao)) bo ((va hanh) OR (va danh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. hieu ((ve bac) OR (ve bao)) bo ((va hanh) or (va danh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu ((ve bac) OR (ve bao)) bo ((va hanh) or (va danh)) vi cua tre*.