Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
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: hoc hieu quang - ((hanh truong) or (hanh trinh)) ((cua tong) OR (cua dong)) cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - ((hanh truong) OR (hanh trinh)) ((cua tong) OR (cua dong)) cong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - ((hanh truong) or (hanh trinh)) ((cua tong) OR (cua dong)) cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - ((hanh truong) or (hanh trinh)) ((cua tong) OR (cua dong)) cong manh toan cao*.