Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
thuc cach » thuoc sach, truoc cach, thuc hanh
cach doan » cach hoan, hach toan, cac doanh
doan phan » doanh phan, toan phan, dan phan
phan tong » phan trong, phan cong, han tong
sach thu » sach thue, sach thieu, sach tham
thu truc » thu tuc, tu truc, thi truc
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tranh thuc cach doan phan tong ) or ( so sach thu truc bach hoa phan tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tranh thuc cach doan phan tong ) OR ( so sach thu truc bach hoa phan tong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tranh thuc cach doan phan tong ) or ( so sach thu truc bach hoa phan tong ))*.