Perhaps you should try some spelling variations:
van thanh » ban thanh
hieu viec » nhieu viec, hieu ve, sieu viet
viec bao » viec ban, viec lam, viec va
bao tuoc » bao tuong, cao thuoc, bach tuoc
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
co cua » con cua, ca cua, cong cua
o hoc » co hoc, mo hoc, so hoc

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 o hoc. hieu viec bao tuoc ((van thanh) or (van tuan)) co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoc. hieu viec bao tuoc ((van thanh) OR (van tuan)) co cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoc. hieu viec bao tuoc ((van thanh) or (van tuan)) co cua tre*.