Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cach dua » cach cua, cach dung, cac du
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cach » va cach, ve cac, ve canh
dua ban » dia ban, cua ban, qua ban
loi cua » loai cua, doi cua, lai cua
hoi cua » hoi chuc
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((x hoi) or (x ho)). hieu ve cach dua ban thanh ((loi cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). hieu ve cach dua ban thanh ((loi cua) OR (hoi cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (x ho)). hieu ve cach dua ban thanh ((loi cua) OR (hoi cua)) tre*".