Perhaps you should try some spelling variations:
ban thanh » ban hang
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
va chua » vua chua, ca chua, va chu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
ha hoi » hoa hoi, ha noi, xa hoi
va cua » via cua, ca cua, ma 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 ky tang ha hoi. hieu ve cham duc ((ban thanh) OR (ban hanh)) ((va cua) or (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky tang ha hoi. hieu ve cham duc ((ban thanh) OR (ban hanh)) ((va cua) OR (va chua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky tang ha hoi. hieu ve cham duc ((ban thanh) OR (ban hanh)) ((va cua) or (va chua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky tang ha hoi. hieu ve cham duc ((ban thanh) OR (ban hanh)) ((va cua) or (va chua)) tre*.