Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thu doanh » thu oanh, tri doanh, thu hoach
phu thong » pho thong, phap thong, khau thong
khoan phi » khoan phai, khoan nhoi, khoang thi
phi thong » phi thuong, pho thong, phi trong
sach dai » sach bai, sach dat, sach dau
khoa phu » khoa phau, khoa thu, hoa phu
sach dao » lanh dao
tu sach » thu sach, su sach, te sach
dai thu » dai thua, dai thuc, doi thu
so sach » so sanh, bo sach, co sach
dao tuc » dao duc
tuc cac » tu cac, tich cac

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 dai thu doanh khoa phu thong ) or ( so sach dao tuc cac khoan phi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dai thu doanh khoa phu thong ) OR ( so sach dao tuc cac khoan phi thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dai thu doanh khoa phu thong ) or ( so sach dao tuc cac khoan phi thong ))*.