Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
te sach » toc sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca cua
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: te sach ((ky sang) OR (ky dang)) ma hoi. hieu va cac ((xuc vay) or (xuc hay)) doanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky dang)) ma hoi. hieu va cac ((xuc vay) OR (xuc hay)) doanh va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) OR (ky dang)) ma hoi. hieu va cac ((xuc vay) or (xuc hay)) doanh va cua te*".