Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
truoc bang » thuoc bang, truoc cang, truoc cong
khoan phu » khoa phu, khoan phai, khoa thu
phu thong » phap thong, khau thong, phan thong
tri truoc » tri thuoc, tri thuc, gi truoc
bang khoa » hang khoa, dang khoa, vang khoa
pho thong » he thong
thuc cac » thuc cach, tuc cac, phuc cac
sanh tri » thanh tri, dinh tri, minh tri
khoa pho » khoa phu, khoa khoa, khoa phau
lu hanh » luu hanh, du hanh, ly hanh
so sanh » do sanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( lu hanh trinh thuc cac khoan phu thong ) or ( so sanh tri truoc bang khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( lu hanh trinh thuc cac khoan phu thong ) OR ( so sanh tri truoc bang khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( lu hanh trinh thuc cac khoan phu thong ) or ( so sanh tri truoc bang khoa pho thong ))*.