Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
cua trong » cua truong, cua trung, qua trong
cong nhat » cong nhan, cong ha, dang nhat
cong suat » nang suat, cong san, cong cua
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: theo hieu lang - ((hanh tranh) or (hanh trinh)) cua trong ((cong nhat) OR (cong suat)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((hanh tranh) OR (hanh trinh)) cua trong ((cong nhat) OR (cong suat)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - ((hanh tranh) or (hanh trinh)) cua trong ((cong nhat) OR (cong suat)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - ((hanh tranh) or (hanh trinh)) cua trong ((cong nhat) OR (cong suat)) toan cao*.