Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
doanh va » doan va, doanh tai, doanh cua
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
tao hoi » tao khoi, tao boi, tay hoi
va cua » va chua, via cua, ca cua
va dao » ca dao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky sang) OR (ky dang)) tao hoi. lieu va dao ((xuc vay) or (xuc hay)) doanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky dang)) tao hoi. lieu va dao ((xuc vay) OR (xuc hay)) doanh va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) OR (ky dang)) tao hoi. lieu va dao ((xuc vay) or (xuc hay)) doanh va cua te*".