Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh ve » thanh va, thanh vien, thanh van
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
duoc va » duc va, duoc ma, duong va
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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 tu nang xa hoi. hieu van thanh ((duoc va) or (nuoc va)) ((thanh ve) OR (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. hieu van thanh ((duoc va) OR (nuoc va)) ((thanh ve) OR (hanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. hieu van thanh ((duoc va) or (nuoc va)) ((thanh ve) OR (hanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. hieu van thanh ((duoc va) or (nuoc va)) ((thanh ve) OR (hanh ve)) cua tre*.