Perhaps you should try some spelling variations:
thanh toan » thanh san, tinh toan
thanh hoa » thanh pho
te sach » toc sach
sach vu » sach va, sach tu, sach uu
luan tu » luan thu, luat tu, tuan tu
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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 vu nang x hoi. hieu va cam ((luc va) OR (tuc va)) ((thanh toan) OR (thanh hoa)) luan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang x hoi. hieu va cam ((luc va) or (tuc va)) ((thanh toan) OR (thanh hoa)) luan tu~".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang x hoi. hieu va cam ((luc va) or (tuc va)) ((thanh toan) OR (thanh hoa)) luan tu*.