Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
hanh trinh » canh tranh, hanh chinh
hang cong » dang cong, hang nong, bang cong
bang song » nang song
thanh cao » thanh ca, thanh cac, thanh thao
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cau sach - hanh trinh luat ((hang cong) or (bang song)) dang thanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - hanh trinh luat ((hang cong) OR (bang song)) dang thanh cao.
• Adding a wildcard symbol may retrieve word variants: theo cau sach - hanh trinh luat ((hang cong) or (bang song)) dang thanh cao*.