Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua hoi » cua moi
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, xa hoi, co hoi
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty hang ((ca hoi) OR (cua hoi)). hieu va cham ((xuc va) or (tuc va)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty hang ((ca hoi) OR (cua hoi)). hieu va cham ((xuc va) OR (tuc va)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty hang ((ca hoi) OR (cua hoi)). hieu va cham ((xuc va) or (tuc va)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ty hang ((ca hoi) OR (cua hoi)). hieu va cham ((xuc va) or (tuc va)) thanh di cua tre*.