Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tru va » truc va, trung va
ve cac » va cac, vien cac

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: vu sach ky lang xa hoi. hieu ve cac ((tru va) OR (tu va)) thanh va ((cua tre) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. hieu ve cac ((tru va) OR (tu va)) thanh va ((cua tre) or (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu ve cac ((tru va) OR (tu va)) thanh va ((cua tre) or (hoa viet))*.