Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van cham » van chat, van tham, va cham
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
tuc ban » thuc ban, truc ban, tuc dan
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tu ban » thu ban, te ban
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: ((tu cach) or (thuoc sach)) ky nang xa hoi. hieu van cham ((tuc ban) OR (tu ban)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) ky nang xa hoi. hieu van cham ((tuc ban) OR (tu ban)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ky nang xa hoi. hieu van cham ((tuc ban) OR (tu ban)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuoc sach)) ky nang xa hoi. hieu van cham ((tuc ban) OR (tu ban)) thanh vi cua tre*.