Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
nhu hieu » nhu hien, nha hieu, nho hieu
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nhu hieu qua - hanh trinh cua ((hang cong) or (dung cong)) dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhu hieu qua - hanh trinh cua ((hang cong) OR (dung cong)) dan ((toan cao) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhu hieu qua - hanh trinh cua ((hang cong) or (dung cong)) dan ((toan cao) OR (toan ban))*".