Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan thong » quang thong, quan trong, xuan thong
thong cong » trong cong, tong cong, thong thong
cong san » cong tac
san tran » tan tran, ban tran, dang tran
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (thien thanh)) - hanh trinh quan thong cong san tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien thanh)) - hanh trinh quan thong cong san tran cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien thanh)) - hanh trinh quan thong cong san tran cau*.