Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach van » sach han, bach van, cach van
thanh vi » hanh vi, thanh va, thanh ve
truc van » truc va, thuc van, truc ban
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao
ve cam » ve cac, va cam, ve cai
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: su ((sach van) or (sach va)) nang xa hoi. hieu ((ve cam) OR (ve cham)) truc van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach van) OR (sach va)) nang xa hoi. hieu ((ve cam) OR (ve cham)) truc van thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach van) or (sach va)) nang xa hoi. hieu ((ve cam) OR (ve cham)) truc van thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach van) or (sach va)) nang xa hoi. hieu ((ve cam) OR (ve cham)) truc van thanh vi cua tre*.