Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hanh luan » khanh luan, hang luan, hanh luat
dung cong » dung trong
hoc kinh » luoc kinh
luan xay » luat xay, luong xay, luan van
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 kinh) or (hoc sinh)) sach - hanh luan xay dung cong thanh ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc kinh) OR (hoc sinh)) sach - hanh luan xay dung cong thanh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc kinh) or (hoc sinh)) sach - hanh luan xay dung cong thanh ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((hoc kinh) or (hoc sinh)) sach - hanh luan xay dung cong thanh ((toan cau) OR (toan cao))*.