Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
vi cu » vi su, vi xu, vi du

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty tang ma hoi. hieu ve cac tu ((van thanh) OR (ban thanh)) vi cu tren~.
• Adding a wildcard symbol may retrieve word variants: te sach ty tang ma hoi. hieu ve cac tu ((van thanh) or (ban thanh)) vi cu tren*.