Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
phan thong » phan thuong, phan hong, phan tong
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc bach » truc bach, thuoc sach, thuc hanh
thuc cach » thuoc sach, truoc cach, thuc hanh
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
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 tren thuc bach hoa phan thong ) or ( tu sach dao thuc cach khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuc bach hoa phan thong ) OR ( tu sach dao thuc cach khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuc bach hoa phan thong ) or ( tu sach dao thuc cach khoan khau thong ))*.