Perhaps you should try some spelling variations:
phai thong » phap thong, phai tuong, phan thong
khoan phai » khong phai, khoa phau, khoan hoi
sach bien » cach bien, sach tien, mach dien
bien thuc » kien thuc, bien phuc, bien phu
thuc hach » thuc hanh, chuc hach, thuc cach
hach toan » thanh toan, manh toan
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc cac » thuc cach, tuc cac, phuc cac
co sach » bo sach, cuon sach, hoc sach
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( co sach bien thuc hach toan thong thong ) or ( te sach tren thuc cac khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( co sach bien thuc hach toan thong thong ) OR ( te sach tren thuc cac khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( co sach bien thuc hach toan thong thong ) or ( te sach tren thuc cac khoan phai thong ))*.