Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
than luc » nhan luc, than duc, thanh luu
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
thi van » thi lan, thi hanh, thi nang
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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 y nang ((cao hoi) or (cao hoc)). ((thien van) OR (thi van)) than luc van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((cao hoi) OR (cao hoc)). ((thien van) OR (thi van)) than luc van thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((cao hoi) or (cao hoc)). ((thien van) OR (thi van)) than luc van thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((cao hoi) or (cao hoc)). ((thien van) OR (thi van)) than luc van thanh vi cua tre*.