Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va doanh » van doanh, vay doanh, va danh
ky dang » ky nang
ky danh » ky anh
hieu ve » hieu va, hieu van
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ky dang) OR (ky danh)) ma hoa. hieu ve cam xuc va doanh tai ((cuc tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky dang) OR (ky danh)) ma hoa. hieu ve cam xuc va doanh tai ((cuc tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky dang) OR (ky danh)) ma hoa. hieu ve cam xuc va doanh tai ((cuc tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky dang) OR (ky danh)) ma hoa. hieu ve cam xuc va doanh tai ((cuc tre) or (cua tre))*.