Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
hanh trinh » canh tranh, hanh chinh
trinh van » trinh han, trinh quan, trinh toan
dang cong » dung cong
dang tran » quang tran, hoang tran, dang van
thau dau » phan dau, chau au
dau sach » cau sach, dat sach, hau sach
van dang » van dong, van dung, van nang

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

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