Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va
xac va » tac va, ac va, bac va

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 ty nang x ho. hieu va cac ((((xuc va) OR (xac va))) or (duc va)) dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x ho. hieu va cac ((((xuc va) OR (xac va))) OR (duc va)) dan dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x ho. hieu va cac ((((xuc va) OR (xac va))) or (duc va)) dan dai cua tre*".