Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh luc » thanh luu, than luc, nhan luc
chat hoc » chat hoa, chat thom, cho hoc
hieu van » hieu va, thien van, lieu va
luc tuan » luc luan, luc quan, luu tuan
te sach » toc sach
cao hoc » co hoc, cho hoc
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
vi 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: te sach y nang ((cao hoc) OR (chat hoc)). hieu van thanh luc tuan anh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cao hoc) OR (chat hoc)). hieu van thanh luc tuan anh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((cao hoc) OR (chat hoc)). hieu van thanh luc tuan anh ((vi cua) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((cao hoc) OR (chat hoc)). hieu van thanh luc tuan anh ((vi cua) or (vai cua)) tre*.