Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
duc phan » dung phan, duc thang, duc phung
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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: so sach ty lang xa hoi. hieu ve cam ((((duc tan) or (dua ban))) or (duc phan)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty lang xa hoi. hieu ve cam ((((duc tan) OR (dua ban))) OR (duc phan)) thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty lang xa hoi. hieu ve cam ((((duc tan) or (dua ban))) or (duc phan)) thanh vi cua tre*.