Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hong phong » thong thong, phong chong, song hong
phong phap » phuong phap, chong phap, khong phap
hoc chieu » hoc thieu, ho chieu, hoc hien
tran tuan » tran quang, tran thanh, tranh luan
tran xuan » tran quang, tran van
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - hanh ((tran tuan) OR (tran xuan)) hong phong phap ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh ((tran tuan) OR (tran xuan)) hong phong phap ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh ((tran tuan) OR (tran xuan)) hong phong phap ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh ((tran tuan) OR (tran xuan)) hong phong phap ((toan cau) or (toan tap))*.