Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
sach doanh » sach danh, sach tranh, cac doanh
trinh tren » trinh truyen, trinh tuyen, trinh tieng
doanh tri » doanh tai, doanh tren, dinh tri
thu sach » tu sach, thuat sach, thuoc sach
tu canh » thu canh, tu chanh, tu can

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 ( tu canh trinh tren ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach doanh tri ) OR ( tu canh trinh tren )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach doanh tri ) or ( tu canh trinh tren ))*.