Perhaps you should try some spelling variations:
quoc tuan » quoc quan, quoc toan, quoc quang
xuc tuan » duc thuan, xuan tuan, duc tan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
anh vi » hanh vi, anh va, anh ve
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 ve) or (lieu va)) cam ((xuc tuan) OR (quoc tuan)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu ve) OR (lieu va)) cam ((xuc tuan) OR (quoc tuan)) anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu ve) or (lieu va)) cam ((xuc tuan) OR (quoc tuan)) anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu ve) or (lieu va)) cam ((xuc tuan) OR (quoc tuan)) anh vi cua tre*.