Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ve coc » ve cuoc, ve cac, ve co
ca cua » co 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) OR (vu khach)) ky lang xa hoi. hieu ve coc luc ((ban thanh) or (gia thanh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky lang xa hoi. hieu ve coc luc ((ban thanh) OR (gia thanh)) ca cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky lang xa hoi. hieu ve coc luc ((ban thanh) or (gia thanh)) ca cua tre*".