Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va cham » va chat, va tham
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ty hang » ly hang, thi hang, thu hang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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