Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chua tuong » chuc thuong, thuat tuong, cua truong
toc chieu » toc thieu, hoc thieu, doi chieu
hanh mang » nhanh mang, nhanh lang, thanh hang
duong bai » cuong bai, duong tai, dung bai
doc hieu » toc thieu, hoc thieu, hoc hien
bai toan » bai tap
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: ((toc chieu) or (doc hieu)) sach - ((hanh mang) OR (hanh trang)) chua tuong duong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc chieu) OR (doc hieu)) sach - ((hanh mang) OR (hanh trang)) chua tuong duong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc chieu) or (doc hieu)) sach - ((hanh mang) OR (hanh trang)) chua tuong duong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((toc chieu) or (doc hieu)) sach - ((hanh mang) OR (hanh trang)) chua tuong duong bai toan cau*.