Perhaps you should try some spelling variations:
theo chinh » thien chinh, te chinh, che chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
luan nhung » luan chung, luan hung, quan nhung
duong minh » duong manh, truong minh, quang minh
thong minh » thong tin, hoang minh
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 chinh sach - ((hanh tranh) or (hanh trinh)) luan nhung ((duong minh) OR (thong minh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chinh sach - ((hanh tranh) OR (hanh trinh)) luan nhung ((duong minh) OR (thong minh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chinh sach - ((hanh tranh) or (hanh trinh)) luan nhung ((duong minh) OR (thong minh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: theo chinh sach - ((hanh tranh) or (hanh trinh)) luan nhung ((duong minh) OR (thong minh)) toan ban*.