Perhaps you should try some spelling variations:
cach khuan » cac khoan
khoa thong » hoa thong, thoai thong, pho thong
cach hoan » cac khoan, sach han, cac hoat
hach toan » thanh toan, manh toan
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tri thuc ((cach khuan) or (((cach hoan) OR (hach toan)))) khoa thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tri thuc ((cach khuan) OR (((cach hoan) OR (hach toan)))) khoa thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tri thuc ((cach khuan) or (((cach hoan) OR (hach toan)))) khoa thong".
• Adding a wildcard symbol may retrieve word variants: tu sach tri thuc ((cach khuan) or (((cach hoan) OR (hach toan)))) khoa thong*.