Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu 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 sach ky nang x hoi. ((hieu va) or (hieu qua)) nam thu va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu va) OR (hieu qua)) nam thu va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu va) or (hieu qua)) nam thu va hanh vi cua tre*.