Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh lai » danh sai, gianh lai, dinh lam
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
xuc va » tuc va, luc va, xac va
cua te » cua tu
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: toc sach ky nang x hoi. hieu va cac ((xuc va) or (duc va)) danh lai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu va cac ((xuc va) OR (duc va)) danh lai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu va cac ((xuc va) or (duc va)) danh lai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu va cac ((xuc va) or (duc va)) danh lai ((cua tre) OR (cua te))*.