Perhaps you should try some spelling variations:
van doanh » toan doanh, van thanh, van anh
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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

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