Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
te sac » te cac, te san

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