Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong huy » cuong huy, dong huy, cong quy
huy van » thuy van, duy van, quy van

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 ((cua thong) OR (cua khong)) cong huy van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh tranh ((cua thong) OR (cua khong)) cong huy van ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh tranh ((cua thong) OR (cua khong)) cong huy van ban*.