Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
bach khong » bach khang, bach phuong, bach khoa
thuc bach » truc bach, thuc cach, thuoc sach
sach phat » sach nha, sach tham, cach pha
phat thuc » phap thuc, pham thuc, phan thuc
pho thong » he thong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa pho » khoa phu, khoa khoa, khoa phau
su hanh » su thanh, du hanh, lu hanh
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su hanh trinh thuc bach khong _ thong ) or ( su sach phat thuc anh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su hanh trinh thuc bach khong _ thong ) OR ( su sach phat thuc anh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su hanh trinh thuc bach khong _ thong ) or ( su sach phat thuc anh khoa pho thong ))*.