Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
toc xa » tuc xa, toc ta, hoc xa
xa dan » ca dan, xa dai, va dan

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 tang) OR (ky nang)) xa hoi. hieu va cac toc xa dan dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) OR (ky nang)) xa hoi. hieu va cac toc xa dan dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) OR (ky nang)) xa hoi. hieu va cac toc xa dan dai cua tre*.