Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, hanh trinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hang nong » thang long
trang va » tran van, hang va
toan cau » toan ban, toan tap, toan tai
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: hoc chiet tach - hanh trang va ((hang nong) OR (han tong)) dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trang va ((hang nong) OR (han tong)) dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh trang va ((hang nong) OR (han tong)) dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trang va ((hang nong) OR (han tong)) dan ((toan cau) or (toan cao))*.