Perhaps you should try some spelling variations:
nhanh tri » nhanh thi, thanh tri, nhanh thai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ro » nang co, nang ho, nang ra
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
ro hai » co hai, o hai, so hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ro hai. ((hieu ve) or (hieu va)) cac ((xuc van) OR (duc van)) nhanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ro hai. ((hieu ve) OR (hieu va)) cac ((xuc van) OR (duc van)) nhanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ro hai. ((hieu ve) or (hieu va)) cac ((xuc van) OR (duc van)) nhanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ro hai. ((hieu ve) or (hieu va)) cac ((xuc van) OR (duc van)) nhanh tri cua tre*.