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

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) OR (sach ty)) nang x hoi. hieu ve cach dua ban thanh ((loi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve cach dua ban thanh ((loi cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve cach dua ban thanh ((loi cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve cach dua ban thanh ((loi cua) or (lai cua)) tre*.