Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khoan khoa » khuan khoa, khoa khoa, toan khoa
khoa thong » hoa thong, thoai thong, pho thong
cach khoan » cac khoan, cach hoan, bach khoa
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
coc khoan » cac khoan, hoc khoa, con khoa
thuc coc » thuc cuoc, thuc co, thuc con
sach dao » lanh dao
cua cach » cua cac, ca cach, cua bach
te sach » toc sach
tu sach » thu sach, su sach, tu cach
dao cua » dai cua, day cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach trien thuc coc khoan khoa thong ) or ( tu sach dao cua cach khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trien thuc coc khoan khoa thong ) OR ( tu sach dao cua cach khoan phai thong ))*.