Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chat duc » chat xuc, chat doc, chet duoc
viet cua » viec cua, viet ca, viet qua
tu cach » tu cac
van anh » tuan anh, van minh
du chat » duoc chat, dung chat, doc chat
hiem du » hien du, diem du, hiem duoc
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sach)) ky nang x hoi. hiem du chat duc ((van anh) OR (van thanh)) viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky nang x hoi. hiem du chat duc ((van anh) OR (van thanh)) viet cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky nang x hoi. hiem du chat duc ((van anh) OR (van thanh)) viet cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky nang x hoi. hiem du chat duc ((van anh) OR (van thanh)) viet cua tre*.