Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sach » chinh sach, chiet tach, chieu sang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
tinh cua » trinh cua, sinh cua, tinh chat
cua bang » chua bang, cua ban, cua dang
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: ho ((hieu quang) or (chieu sach)) - hanh tinh cua bang ((cong manh) OR (cong danh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chieu sach)) - hanh tinh cua bang ((cong manh) OR (cong danh)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (chieu sach)) - hanh tinh cua bang ((cong manh) OR (cong danh)) toan cau*".