Perhaps you should try some spelling variations:
ban lang » ban hang, ba lang, ban dang
dang xay » dang van, van xay
xay phoi » cay phoi, cap phoi, tay hoi
su sach » so sach
cam duc » cam xuc, cao duc, pham duc
khi cua » chi cua, thai cua
phi cua » phai cua, chi cua, thi cua
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky dang xay phoi. hieu ve cam duc ban lang ((phi cua) OR (khi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang xay phoi. hieu ve cam duc ban lang ((phi cua) OR (khi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky dang xay phoi. hieu ve cam duc ban lang ((phi cua) OR (khi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky dang xay phoi. hieu ve cam duc ban lang ((phi cua) OR (khi cua)) tre*.