Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van than » van thang, van tuan, van phan
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
luc van » luoc van, luu van, duc van
van anh » tuan anh, van minh
anh vai » anh va, anh bai, anh van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 than) OR (van thanh)) luc van anh vai 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 than) OR (van thanh)) luc van anh vai 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 than) OR (van thanh)) luc van anh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((cao hoi) or (cao hoc)). thien ((van than) OR (van thanh)) luc van anh vai cua tre*.