Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
xuc ban » duc ban, cuc ban, quoc ban
danh du » danh dau, danh tu, dinh du
cuu tre » cua tre, cau tren, cau treo
danh d » danh di, anh d, danh o
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: tu sach ky nang x hoi. ((hieu va) or (lieu va)) cam xuc ban ((danh d) OR (danh du)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu va) OR (lieu va)) cam xuc ban ((danh d) OR (danh du)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu va) or (lieu va)) cam xuc ban ((danh d) OR (danh du)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu va) or (lieu va)) cam xuc ban ((danh d) OR (danh du)) cuu tre*.