Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
tong cung » thong cung, trong cung, tong cong
doan tuan » doan quan, doanh luan, doan quang
hieu van » hieu va, thien van, lieu va
tung cua » trung cua, tuong cua, dung cua
cua tong » cua cong, cua dong, cua nong
cung cap » trung cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu van) or (hieu lang)) - thanh tung cua tong cung cap ((doan tuan) or (doanh tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu van) OR (hieu lang)) - thanh tung cua tong cung cap ((doan tuan) OR (doanh tai)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu van) or (hieu lang)) - thanh tung cua tong cung cap ((doan tuan) or (doanh tai))*.