Perhaps you should try some spelling variations:
cong thuong » hang thuong
thanh trung » thanh tung
thuong den » huong den, thong den, tuong den
hoc thieu » hoc hien
trung ca » trung cap, truong ca, trung cua
den phan » dien phan, dan phan, de phan
ca cong » cua cong, cac cong, cao cong

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 (hoc thieu)) tinh - thanh trung ca cong thuong den phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (hoc thieu)) tinh - thanh trung ca cong thuong den phan tu*.