Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
chua hang » cua hang, chua nang, chua xang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
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 ((hieu manh) or (chieu sach)) - canh tranh chua hang cong dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu sach)) - canh tranh chua hang cong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu sach)) - canh tranh chua hang cong dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu sach)) - canh tranh chua hang cong dan ((toan cao) OR (toan ban))*.