Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chat » tinh chat, trinh luat, trinh han
luong long » luong cong, luong trong, luong khong
doi chieu » doc hieu, doi chi, mot chieu
long san » long span, luong san, cong san
san phan » san pham, van phan, sat phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (doi chieu)) tinh - hanh trinh chat luong long san phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (doi chieu)) tinh - hanh trinh chat luong long san phan tu*.