Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
van dai » vanh dai, van hai, can dai
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, tuc xa, duc va
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 ty nang x hoi. hieu va cac ((tuc va) OR (truc va)) ((van dai) or (van dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu va cac ((tuc va) OR (truc va)) ((van dai) OR (van dao)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu va cac ((tuc va) OR (truc va)) ((van dai) or (van dao)) cua tre*".