Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
bach tuoc » sach duoc, sach nuoc
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
thanh co » thanh do, thanh ca, thanh ho
tuoc van » luoc van, quoc van, thuoc von
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
co cua » con cua, ca cua, cong cua
o hoc » mo hoc, so hoc, y 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) OR (ty hang)) ((o hoc) or (co hoc)). hieu viec bach tuoc van thanh co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) ((o hoc) OR (co hoc)). hieu viec bach tuoc van thanh co cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) ((o hoc) or (co hoc)). hieu viec bach tuoc van thanh co cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) ((o hoc) or (co hoc)). hieu viec bach tuoc van thanh co cua tre*.