Perhaps you should try some spelling variations:
hien khong » tien khong, chien chong, chieu khong
dien khong » dien hong, dieu khong, tien khong
luong cong » dung cong, trong cong, cong cong
hanh mang » nhanh mang, hanh trang, nhanh lang
mang chat » van chat, mang cua, ban chat
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien khong) OR (dien khong)) - hanh mang chat luong cong ((xuan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khong) OR (dien khong)) - hanh mang chat luong cong ((xuan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien khong) OR (dien khong)) - hanh mang chat luong cong ((xuan toan) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien khong) OR (dien khong)) - hanh mang chat luong cong ((xuan toan) or (dan than)) cau*.