Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
duc ban » duc tan, duc van, dua ban
sach tu » sach thu, sach ty, sach uu
cach tu » cach thuc
xang x » nang x
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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) OR (cach tu)) xang x hoi. hieu ((ve cac) or (va cam)) duc ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (cach tu)) xang x hoi. hieu ((ve cac) OR (va cam)) duc ban thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) OR (cach tu)) xang x hoi. hieu ((ve cac) or (va cam)) duc ban thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) OR (cach tu)) xang x hoi. hieu ((ve cac) or (va cam)) duc ban thanh vi cua viet*.