Perhaps you should try some spelling variations:
quan trong » gian trong
chieu sach » chinh sach, chiet tach, chieu sang
thong manh » thong minh, thong danh, thong lanh
thong mang » thong quang, thong minh, thong van
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh ban » thanh ban, hang ban, hanh san
ban quan » van quan
toan cau » toan cao, toan ban, toan tap

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)) - hanh ban quan trong ((thong manh) OR (thong mang)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu sach)) - hanh ban quan trong ((thong manh) OR (thong mang)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu sach)) - hanh ban quan trong ((thong manh) OR (thong mang)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu sach)) - hanh ban quan trong ((thong manh) OR (thong mang)) toan cau*.