Perhaps you should try some spelling variations:
chiet tach » chieu sach
nang luong » nang song
luong manh » duong manh, luong thanh, duong minh
dung nhua » dung nha, dung nhung, dung cua
dung khoa » dung cho
ho chiet » ho chieu, ho thiet, hoc thiet
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - manh ((dung nhua) OR (dung khoa)) nang luong manh ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - manh ((dung nhua) OR (dung khoa)) nang luong manh ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - manh ((dung nhua) OR (dung khoa)) nang luong manh ((toan cau) or (toan cao))*.