Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
vu khach » vu khanh, vu khac, vay khach
va thanh » gia thanh, va tinh, le thanh
so sach » so sanh, bo sach, co sach
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
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 khach)) ty hang xa hoi. hieu qua cham luc ((va thanh) OR (ban thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu khach)) ty hang xa hoi. hieu qua cham luc ((va thanh) OR (ban thanh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu khach)) ty hang xa hoi. hieu qua cham luc ((va thanh) OR (ban thanh)) vi cua tre*".