Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sach » chinh sach, chiet tach, chieu sang
phong dung » phuong dung, thong dung, khong dung
canh tran » canh tranh, hanh trang, banh trang
dung manh » duong manh, dung danh, hung manh
tran hai » tran bai, tran chau, tran nhat
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: ho ((hieu quang) or (chieu sach)) - canh tran hai phong dung manh ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chieu sach)) - canh tran hai phong dung manh ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chieu sach)) - canh tran hai phong dung manh ((toan cau) or (toan cao))*.