Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
phau thong » phap thong, khau thong, phan thong
khoan phai » khong phai, khoan hoi, khoan nhoi
phai thong » phap thong, phai tuong, phan thong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phau » hoa phan, khoa kham, khoa than
sach giai » sach giao, cac giai, sach bai
bao khoan » bao khoa, tao khoang, cac khoan
thu sach » tu sach, thuat sach, thuoc sach
tich bao » tich va, tich cac
tu hanh » du hanh, lu hanh, thuc hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hanh trinh thuc cach khoa phau thong ) or ( thu sach giai tich bao khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh trinh thuc cach khoa phau thong ) OR ( thu sach giai tich bao khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trinh thuc cach khoa phau thong ) or ( thu sach giai tich bao khoan phai thong ))*.