Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
tieu sach » chieu sach, dien sach, te sach
cong manh » cong danh, duong manh, cong thanh
luan han » luan hoan, luan phan, luan van
han cong » phan cong, hang cong, hanh cong
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh trinh luan han cong manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh trinh luan han cong manh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh trinh luan han cong manh ((toan cao) or (toan ban))*.