Perhaps you should try some spelling variations:
"toc van doanh chien" » "toc van doan thien", "toc van hoach chien", "toc van khanh chien", "toc toan doanh chien", "toc van dong chien", "toc van thanh chien", "hoc van doanh chien", "toc san doanh chien", "tac van doanh chien"
"hoc cac doanh tri" » "hoc cac dan tri", "hoc cac dang tri", "hoc cho doanh tri", "hoc cac doanh tai", "hoc cac doanh tren", "hoc cac dinh tri", "hoc cao doanh tri"
"hoc sach dinh tien" » "hoc sach kinh tien", "hoc sach danh tien", "hoc hoach dinh tien", "hoc sach dinh dien", "hoc sach dinh tieu", "hoc sach dinh kien", "hoc sinh dinh tien", "hoc anh dinh tien"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("hoc cac doanh tri") or ((("hoc sach dinh tien") or ("toc van doanh chien"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("hoc cac doanh tri") OR ((("hoc sach dinh tien") OR ("toc van doanh chien")))).
• Removing quotes may allow a broader search: (( hoc cac doanh tri ) or ((( hoc sach dinh tien ) or ( toc van doanh chien )))).
• Adding a wildcard symbol may retrieve word variants: (("hoc cac doanh tri") or ((("hoc sach dinh tien") or ("toc van doanh chien"))))*.