Perhaps you should try some spelling variations:
thuong thuat » thuong thuyet, thuong thuc, trong thuat
trung thuat » trong thuat, trung tuan, trung thuc
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong manh » cong danh, duong manh, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - manh ((trung thuat) OR (thuong thuat)) nhung cong manh ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - manh ((trung thuat) OR (thuong thuat)) nhung cong manh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - manh ((trung thuat) OR (thuong thuat)) nhung cong manh ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - manh ((trung thuat) OR (thuong thuat)) nhung cong manh ((toan cau) or (toan ban))*.