Perhaps you should try some spelling variations:
phong dung » phuong dung, thong dung, khong dung
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh van » tran van, trinh van, thanh van
van phong » van dong, hai phong
dung manh » duong manh, dung danh, hung manh
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 lang) or (chieu sach)) - canh tranh van phong dung manh ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - canh tranh van phong dung manh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chieu sach)) - canh tranh van phong dung manh ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - canh tranh van phong dung manh ((toan cau) OR (toan cao))*.