Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ky sang » ky dang, ky tang, duy sang
ve cam » ve cac, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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 sang) OR (ky nang)) ma hoi. hieu ((ve cam) or (ve cham)) xuc va doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky nang)) ma hoi. hieu ((ve cam) OR (ve cham)) xuc va doanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) OR (ky nang)) ma hoi. hieu ((ve cam) or (ve cham)) xuc va doanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) OR (ky nang)) ma hoi. hieu ((ve cam) or (ve cham)) xuc va doanh va cua tre*.