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