Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dang cong » dung cong
cong cong » cong dong, trong cong, dung cong
hoc phan » hoc dan
dan toan » van toan, dan than, manh toan
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: ((hoc phan) OR (hoc pho)) tinh - hanh trinh cua ((dang cong) or (cong cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc phan) OR (hoc pho)) tinh - hanh trinh cua ((dang cong) OR (cong cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc phan) OR (hoc pho)) tinh - hanh trinh cua ((dang cong) or (cong cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc phan) OR (hoc pho)) tinh - hanh trinh cua ((dang cong) or (cong cong)) dan toan ban*.