Perhaps you should try some spelling variations:
"su vach tranh tien" » "su sach tranh tien", "su vach tran tien", "su canh tranh tien", "su vach thanh tien", "su vach trinh tien", "su vach tranh bien"
"thu sach doanh tri" » "thu sach danh tri", "thu sach tranh tri", "thu cac doanh tri", "thu sach doanh tai", "thu sach doanh tren", "thu sach dinh tri", "tu sach doanh tri", "thuat sach doanh tri", "thuoc sach doanh tri"
"su sach tran tien" » "su sach tranh tien", "su sach tren tien", "su vach tran tien", "su sach tran thien", "su sach toan tien", "su sach tran hien", "so sach tran tien", "vu sach tran tien"

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

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