Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
cuc phuong » cac phuong, cua phuong, chuc thuong
cuu phuong » cac phuong, thu phuong
hieu lang » chieu sang, hieu quang, nhieu tang
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cao » toan ban
toan tap » toan 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 hieu lang - hanh tranh ((cuc phuong) OR (cuu phuong)) pham thanh ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tranh ((cuc phuong) OR (cuu phuong)) pham thanh ((toan cao) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh tranh ((cuc phuong) OR (cuu phuong)) pham thanh ((toan cao) or (toan tap))*".