Perhaps you should try some spelling variations:
hanh thinh » hanh chinh, hanh trinh, hanh tinh
thinh chat » tinh chat, trinh chat, thinh phat
luong long » luong cong, luong trong, luong khong
doi chieu » doc hieu, doi chi, mot chieu
long dan » long doan, cong dan, nong dan
dan phan » doan phan, dan chan, van 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 thinh chat luong long dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (doi chieu)) tinh - hanh thinh chat luong long dan phan tu*.