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