Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, nhung don
hoc chieu » hoc thieu, ho chieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
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 chieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((toan cau) or (toan cao))*.