Perhaps you should try some spelling variations:
khoan phan » khoan phai, khoan thanh, hoa phan
cach khoan » cac khoan, cach hoan, coc khoan
phan xuong » phan cong
bach khoa » anh khoa
phu thong » pho thong, phap thong, khau thong
thuc cach » thuoc sach, truoc cach, thuc hanh
bai truc » ba truc, dai truc, bai thuoc
khoa phu » khoa phau, khoa thu, hoa phu
thu sach » tu sach, thuat sach, thuoc sach
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te cac bai truc bach khoa phu thong ) or ( thu sach dao thuc cach khoan phan xuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te cac bai truc bach khoa phu thong ) OR ( thu sach dao thuc cach khoan phan xuong )).
• Adding a wildcard symbol may retrieve word variants: (( te cac bai truc bach khoa phu thong ) or ( thu sach dao thuc cach khoan phan xuong ))*.