Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
hieu quang » thieu quang, hieu quan, hieu qua
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua tong » cua cong, cua dong, cua nong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu quang - ((hanh truong) or (canh tranh)) cua tong cong ((manh toan) OR (tinh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - ((hanh truong) OR (canh tranh)) cua tong cong ((manh toan) OR (tinh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - ((hanh truong) or (canh tranh)) cua tong cong ((manh toan) OR (tinh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - ((hanh truong) or (canh tranh)) cua tong cong ((manh toan) OR (tinh toan)) cao*.