Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
vu sach » vu bach, su sach, vu khach
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu sach)) ty hang xa hoi. hieu qua cham ((luc va) OR (duc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu sach)) ty hang xa hoi. hieu qua cham ((luc va) OR (duc va)) thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu sach)) ty hang xa hoi. hieu qua cham ((luc va) OR (duc va)) thanh vi cua tre*".